Dyfyniad APA

De Kruif, P. (1938). The fight for life. Harcourt, Brace and company.

Dyfyniad Arddull Chicago

De Kruif, Paul. The Fight for Life. New York: Harcourt, Brace and company, 1938.

Dyfyniad MLA

De Kruif, Paul. The Fight for Life. Harcourt, Brace and company, 1938.

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