Cooley, J. C. (1942). A primer of formal logic. Macmillan.
Lua i Stíl Chicago (17ú heag.)Cooley, John C. A Primer of Formal Logic. New York: Macmillan, 1942.
Lua MLA (8ú heag.)Cooley, John C. A Primer of Formal Logic. Macmillan, 1942.
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