Παραπομπή APA

Ravenel, M. P. (1940). Annual Report of the Surgeon General of the Public Health Service of the United States, for the Fiscal Year 1939.

Παραπομπή Chicago Style

Ravenel, Mazÿck P. Annual Report of the Surgeon General of the Public Health Service of the United States, for the Fiscal Year 1939. 1940.

Παραπομπή MLA

Ravenel, Mazÿck P. Annual Report of the Surgeon General of the Public Health Service of the United States, for the Fiscal Year 1939. 1940.

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