The Gospel of Thomas: Original Text with Commentary
Stuttgart: Bibelgesellschaft, 2007.
Available in the UK and Europe at Alban Books.
Enno Edzard Popkes
Christopher W. Skinner
John and Thomas - Gospels in Conflict? Johannine Characterization and the Thomas Question
PTM; Eugene, OR: Pickwick, 2009.
Available through Wipf & Stock in the USA.