Ahaus, H. (1932). Pope Pius XI and Foreign Missions. New York.
Chicago Style aipamenaAhaus, H. Pope Pius XI and Foreign Missions. New York, 1932.
MLA aipamenaAhaus, H. Pope Pius XI and Foreign Missions. New York, 1932.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.