The most recent issue of New Testament Studies contains an article written by Simon Gathercole on the relationship between Luke and the Gospel of Thomas. Gathercole examines the views of Greg Riley and Steven Johnson, that certain awkward phrases and concepts in Luke show evidence of reliance upon Thomas. He provides a helpful critique along with his own position that Thomas knew Luke, but Lukan influence upon Thomas is “very probably indirect” (p. 143).
(To read the other side, see Gregory J. Riley, “Influence of Thomas Christianity on Luke 12:14 and 5:39,” HTR 88 : 229-35; and Steven R. Johnson, “The Hidden/Revealed Saying in the Greek and Coptic Versions of Gos. Thom. 5 & 6,” NovT 44 : 176-85; idem, “The Gospel of Thomas 76.3 and Canonical Parallels: Three Segments in the Tradition History of the Saying,” in John D. Turner and Anne McGuire, eds., The Nag Hammadi Library After Fifty Years: Proceedings of the 1995 Society of Biblical Literature Commemoration [NHMS 44; Leiden: Brill, 1997], 308-25; idem, Seeking the Imperishable Treasure: Wealth, Wisdom, and a Jesus Saying [Eugene, OR: Cascade, 2008]).