Cita APA (7th ed.)

Kelly, J. (1997). The Essence of Logic: The Essence of Logic. Prentice-Hall of India.

Cita Chicago (17th ed.)

Kelly, John. The Essence of Logic: The Essence of Logic. New Delhi: Prentice-Hall of India, 1997.

Cita MLA (9th ed.)

Kelly, John. The Essence of Logic: The Essence of Logic. Prentice-Hall of India, 1997.