2011. “The Text of P127 (P. Oxy. 4968) and Its Relationship with the Text of Codex Bezae.” Novum Testamentum 53: 107-152
2007. “Rivals in Heaven: Angels in the Epistle to the Hebrews.” Pages 356-377 in Angels: The Concept of Celestial Beings – Origins, Development and Reception. Edited by F. V. Reiterer, T. Nicklas, and K. Schöpflin. Deuterocanonical and Cognate Literature Yearbook 2007. Berlin: Walter de Gruyter.