Cita APA (7th ed.)

Wolfrom, S. (1987). Philosophical logic: An introduction. Routledge.

Cita Chicago (17th ed.)

Wolfrom, Sybil. Philosophical Logic: An Introduction. London: Routledge, 1987.

Cita MLA (9th ed.)

Wolfrom, Sybil. Philosophical Logic: An Introduction. Routledge, 1987.