Semper, I. J. (1939). The battle of the books. National Organization for Decent Literature.
Lua i Stíl Chicago (17ú heag.)Semper, Isidore Joseph. The Battle of the Books. Dubuque, Iowa: National Organization for Decent Literature, 1939.
Lua MLA (8ú heag.)Semper, Isidore Joseph. The Battle of the Books. National Organization for Decent Literature, 1939.
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