Cita APA (7a ed.)

McCallum, G. P. (1985). The secret formula. Alhambra.

Cita Chicago Style (17a ed.)

McCallum, George P. The Secret Formula. Madrid: Alhambra, 1985.

Cita MLA (9a ed.)

McCallum, George P. The Secret Formula. Alhambra, 1985.