Não informado. (1948). Speculum. Ohio State University, College of Veterinary Medicine.
Lua i Stíl Chicago (17ú heag.)Não informado. Speculum. Columbus, Ohio: Ohio State University, College of Veterinary Medicine, 1948.
Lua MLA (8ú heag.)Não informado. Speculum. Ohio State University, College of Veterinary Medicine, 1948.
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