Cita APA (7th ed.)

Sanford, D. H. (1992). If P, then Q.: Conditionals and the foundations of reasoning. Routledge.

Cita Chicago (17th ed.)

Sanford, David H. If P, Then Q.: Conditionals and the Foundations of Reasoning. London: Routledge, 1992.

Cita MLA (9th ed.)

Sanford, David H. If P, Then Q.: Conditionals and the Foundations of Reasoning. Routledge, 1992.