APA-referens (7:e uppl.)

Schumann, E. A. (1921). Extra-uterine pregnancy. D. Appleton and company.

Chicago-referens (17:e uppl.)

Schumann, Edward Armin. Extra-uterine Pregnancy. New York, London: D. Appleton and company, 1921.

MLA-referens (8:e uppl.)

Schumann, Edward Armin. Extra-uterine Pregnancy. D. Appleton and company, 1921.