Cox, I. W. (19). The Folly of Human Sterilization. New York.
Lua i Stíl Chicago (17ú heag.)Cox, Ignatius W. The Folly of Human Sterilization. New York, 19.
Lua MLA (8ú heag.)Cox, Ignatius W. The Folly of Human Sterilization. New York, 19.
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