Jose Orlandis, 1993, "A Short History of the Catholic Church," 2nd edn. (Michael Adams, Trans.), Dublin:Four Courts Press, ISBN1851821252, preface, see [1], accessed ngày 8 tháng 12 năm 2014. p. (preface)
Roman Catholicism, "Roman Catholicism, Christian church that has been the decisive spiritual force in the history of Western civilization". Encyclopædia Britannica
Martin., Hengel (2003). Judaism and Hellenism: studies in their encounter in Palestine during the early Hellenistic period. Eugene, OR: Wipf & Stock Publishers. ISBN978-1-59244-186-0. OCLC52605048.
Early Christianity in its Hellenistic context. Volume 2, Christian origins and Hellenistic Judaism: social and literary contexts for the New Testament. Porter, Stanley E., 1956-, E.J. Brill (Firm). Leiden: Brill. 2013. ISBN978-9004234765. OCLC851653645.Quản lý CS1: khác (liên kết)