Cooley, J. C. (1949). A primer of formal logic. The Macmillan company.
Cita Chicago (17th ed.)Cooley, John Cleveland. A Primer of Formal Logic. New York: The Macmillan company, 1949.
Cita MLA (9th ed.)Cooley, John Cleveland. A Primer of Formal Logic. The Macmillan company, 1949.
Atenció: Aquestes cites poden no estar 100% correctes.