Cita APA (7th ed.)

Madrigal, M. (1960). Madrigal's key to spanish. Doubleday.

Cita Chicago (17th ed.)

Madrigal, Margarita. Madrigal's Key to Spanish. New York: Doubleday, 1960.

Cita MLA (9th ed.)

Madrigal, Margarita. Madrigal's Key to Spanish. Doubleday, 1960.