Philippe Bobichon, "L'enseignement juif, païen, hérétique et chrétien dans l'œuvre de Justin Martyr", Revue des Études Augustiniennes 45/2 (1999), pp. 233-259 online
Jewish Encyclopedia: Jesus notes: "Jesus, however, does not appear to have taken into account the fact that the Halakah was at this period just becoming crystallized, and that much variation existed as to its definite form; the disputes of the Bet Hillel and Bet Shammai were occurring about the time of his maturity."
McGrath, Alister E., Christianity: An Introduction. Blackwell Publishing (2006). ISBN1-4051-0899-1. p. 174: "In effect, they [Jewish Christians] seemed to regard Christianity as an affirmation of every aspect of contemporary Judaism, with the addition of one extra belief—that Jesus is the Messiah. Unless males were circumcised, they could not be saved[[|]] Acts:15:1.";see also Paleo-orthodoxy
