Helmut Koester Ancient Christian Gospels: Their History and Development, SCM Press, 1990. P. 85.
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H. Montefiore. A comparison of the Parables of the Gospel According to Thomas and of the Synoptic Gospels; H. Montefiore and H. E. W. Turner Thomas and the Evangelist Studies in Biblical Theology, 35; 1962. P. 78.