Altizer, Thomas. 1963. "Nirvana and Kingdom of God." The Journal of Religion 43, no. 2: 105-17.
Baruch. 2009. In The Apocrypha: Including Books from the Ethiopic Bible, edited by Joseph Lumpkin. Blountsville, Alabama: Fifth Estate.
Benz, Ernst. 2008. The Eastern Orthodox Church: Its Thought and Life. London: Routledge.
Betz, Hans Dieter. 2007. Religion past & present: encyclopedia of theology and religion. Brill.
Bruce, Frederick. 1974. Jesus and Christian Origins Outside the New Testament. Grand Rapids, Michigan: Eerdmans Publishing Co.
Burge, Gary. 2014. "Gospel of John." In The Routledge Encyclopedia of the Historical Jesus, edited by Craig A. Evans. London: Routledge.
Chilton, Bruce and Craig Evans. 1998. Studying the Historical Jesus. Leiden: Brill.
Clement of Alexandria. 1885. Stromata. Translated by William Wilson. In The Apostolic Fathers, edited by Philip Schaff. Grand Rapids, Michigan: Christian Classics Ethereal Library.
Clement of Rome. 1907. An Ancient Homily. In The Apostolic Fathers. Translated by Joseph B. Lightfoot. New York: Macmillan.
Cross, Frank and Elizabeth Livingstone. 1997. "Kingdom of God." In The Oxford Dictionary of the Christian Church. Oxford: Oxford University Press.
Crossan, John. 1991. The Historical Jesus: The Life of a Mediterranean Jewish Peasant. San Francisco: HarperCollins.
Crossan, John. 1999. The Birth of Christianity: Discovering What Happened in the Years Immediately After the Execution of Jesus. San Francisco: HarperOne.
Crossan, John. 2008. In Fragments: The Aphorisms of Jesus. Wipf and Stock.
Crowley, Aleister. 1994. Magick. Newburyport, MA: Weiser Books.
Dunn, James and John Rogerson. 2003. Eerdmans Commentary on the Bible. Grand Rapids, Michigan: Wm. B. Eerdmans Publishing.
Ehrman, Bart. 2003. Lost Scriptures. Oxford: Oxford University Press.
Erickson, Millard. 2001. Introducing Christian Doctrine. Ada, Michigan: Baker Academic.
Foster, Robert. 2002. "Why on Earth Use Kingdom of Heaven? Matthew's Terminology Revisited." New Testament Studies 48, no. 4: 487-99.
France, Richard. 2003. Divine Government: God's Kingship in the Gospel of Mark. Vancouver, BC: Regent College Publishing.
Funk, Robert, and Roy W. Hoover. 1993. The Five Gospels: The Search for the Authentic Words of Jesus. San Francisco: Harper San Francisco.
Gathercole, Simon. 2014. The Gospel of Thomas; Introduction and Commentary. Leiden: Brill.
Grant, Robert and David Freedman. 1960. The Secret Sayings of Jesus according to The Gospel of Thomas. Glasgow: Fontana Books.
Grenz, Stanley. 2000. Theology for the Community of God. Grand Rapids, Michigan: Eerdmans.
Hippolytus. 1886. The Refutation of All Heresies. Translated by J. MacMahon. In The Apostolic fathers, edited by Philip Schaff. Grand Rapids, Michigan: Christian Classics Ethereal Library.
Jeremias, Joachim. 2003. Parables of Jesus. London: Student Christian Movement Press.
King, Karen. 1987. "Kingdom in the Gospel of Thomas." Foundations and Facets Forum 3, no. 1: 48-97.
Koester, Helmut. 2000. Introduction to the New Testament. Berlin: Walter de Gruyter.
Leon-Dufour, Xavier. 1967. "Kingdom of God." In Dictionary of Biblical Theology. New York: Desclee Co.
Lüdemann, Gerd. 2001. Jesus After 2000 Years. Amherst, New York: Prometheus.
Marjanen, Antti. 1998. "Is Thomas a Gnostic Gospel?" In Thomas at the Crossroads: Essays on The Gospel of Thomas, edited by Risto Uro. Edinburgh: Clark.
Meyer, Marvin. 1992. The Gospel of Thomas: The Hidden Sayings of Jesus. San Francisco: Harper & Collins.
Miller, Betsey. 1967. "A Study of the Theme of Kingdom, the Gospel According to Thomas: Logion 18", Novum Testamentum 9, no. 1: 52-60.
Origen. 1996. Homilies on Luke. in The Library of Fathers of the Holy Catholic Church. Translated by Joseph Lienhard. Washington DC: The Catholic University of America.
Pagels, Elaine. 1395 Sh. Injīl-hāyi ganūsī [The Gnostic Gospels]. Translated by Mashallah Koochaki Meibodi. Tehran: Elmi va Farhangi.
Pentecost, John D. 1998. The Parables of Jesus: Lessons in Life from the Master Teacher. Grand Rapids, Michigan: Kregel Publications.
Perkins, Pheme. 2007. Introduction to the Synoptic Gospels. Grand Rapids, Michigan: Wm. B. Eerdmans.
Rahner, Karl. 2004. Encyclopedia of Theology. London: Burns & Oates.
Robinson, James M. 1990. The Nag Hammadi Library. San Francisco: Harper One.
Rudolph, Kurt. 1987. Gnosis: The Nature & History of Gnosticism. Translated by Robert McLachlan Wilson. San Francisco: Harper.
Safra, Jacob E. 2006. "Kingdom of God." In Britannica Encyclopedia of World Religions.
Scholem, Gershom. 1392 Sh. Girāyish-hā va makātib-i aṣlī-yi ʿirfān-i Yahūd [Major Trends in Jewish Mysticism]. Qom: University of Religions and Denominations.
Scott, Bernard. 1989. Hear Then the Parable: A Commentary on the Parables of Jesus. Minneapolis, MN: Fortress Press.
Teachings of Silvanus. 1990. In The Nag Hammadi Library, edited by James M. Robinson. San Francisco: Harper One.
Unterman, Alan. 2007. "Shekhinah." In Encyclopaedia Judaica, edited by M. Berenbaum & F. Skolnik. Jerusalem: Keter Publishing House.
Vanhoozer, Kevin and Nicholas Wright. 2006. Dictionary for Theological Interpretation of the Bible. Ada, Michigan: Baker Academic.
Wilson, Robert McLachlan. 1960. Studies in Gospel of Thomas. Birmingham: A. R. Mowbray & Co. Limited.