Cita APA (7a ed.)

Mangold, W. (1955). New active english: Tomo Primero (6a ed.). Mangold.

Cita Chicago Style (17a ed.)

Mangold, Walter. New Active English: Tomo Primero. 6a ed. Madrid: Mangold, 1955.

Cita MLA (9a ed.)

Mangold, Walter. New Active English: Tomo Primero. 6a ed. Mangold, 1955.