Cita APA (7th ed.)

Salmon, M. H., & Fogelin, R. J. (1989). Introduction to logic and critical thinking (2nd ed.). Harcourt Brace Jovanovich.

Cita Chicago (17th ed.)

Salmon, Merrilee H., i Robert J. Fogelin. Introduction to Logic and Critical Thinking. 2nd ed. San Diego: Harcourt Brace Jovanovich, 1989.

Cita MLA (9th ed.)

Salmon, Merrilee H., i Robert J. Fogelin. Introduction to Logic and Critical Thinking. 2nd ed. Harcourt Brace Jovanovich, 1989.