Cita APA (7a ed.)

De Kruif, P., & De Kruif, R. B. (1936). Why keep them alive? Harcourt, Brace and Company.

Cita Chicago Style (17a ed.)

De Kruif, Paul, y Rhea Barbarin De Kruif. Why Keep Them Alive? New York: Harcourt, Brace and Company, 1936.

Cita MLA (8a ed.)

De Kruif, Paul, y Rhea Barbarin De Kruif. Why Keep Them Alive? Harcourt, Brace and Company, 1936.