Cita APA (7a ed.)

Norman, J., & Sylvan, R. (1989). Directions in relevant logic. Kluwer Academic Publishers.

Cita Chicago Style (17a ed.)

Norman, Jean, y Richard Sylvan. Directions in Relevant Logic. Dordrecht [etc.]: Kluwer Academic Publishers, 1989.

Cita MLA (9a ed.)

Norman, Jean, y Richard Sylvan. Directions in Relevant Logic. Kluwer Academic Publishers, 1989.