Não informado. (1941). Medical Bulletin. Standard Oil Company and Affiliated Companies.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Medical Bulletin. New York: Standard Oil Company and Affiliated Companies, 1941.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Medical Bulletin. Standard Oil Company and Affiliated Companies, 1941.
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