APA (7th ed.) Citation

Blet, P., Martini, A., & Schneider, B. (1968). Records and documents of the Holy See relating to the Second World War (English ed.). Herder Publications.

Chicago Style (17th ed.) Citation

Blet, Pierre, Angelo Martini, and Burkhart Schneider. Records and Documents of the Holy See Relating to the Second World War. English ed. London: Herder Publications, 1968.

MLA (9th ed.) Citation

Blet, Pierre, et al. Records and Documents of the Holy See Relating to the Second World War. English ed. Herder Publications, 1968.