APA-referens (7:e uppl.)

Schumann, E. A. (1931). Extra-uterine pregnancy. Appleton.

Chicago-referens (17:e uppl.)

Schumann, Edward Armin. Extra-uterine Pregnancy. New York: Appleton, 1931.

MLA-referens (8:e uppl.)

Schumann, Edward Armin. Extra-uterine Pregnancy. Appleton, 1931.