Cita APA (7th ed.)

Jeffrey, R. C. (1967). Formal Logic: Its Scope and Limits. McGraw-Hill.

Cita Chicago (17th ed.)

Jeffrey, Richard C. Formal Logic: Its Scope and Limits. New York: McGraw-Hill, 1967.

Cita MLA (9th ed.)

Jeffrey, Richard C. Formal Logic: Its Scope and Limits. McGraw-Hill, 1967.