Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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