Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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