APA (7th ed.) Citation

Diez de la Cortina, R. (1966). Cortina´s spanish in 20 lessons illustrated. Dobleday.

Chicago Style (17th ed.) Citation

Diez de la Cortina, R. Cortina´s Spanish in 20 Lessons Illustrated. New York: Dobleday, 1966.

MLA (9th ed.) Citation

Diez de la Cortina, R. Cortina´s Spanish in 20 Lessons Illustrated. Dobleday, 1966.