APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Mangold, Walter. New Active English. 6a. ed. Mangold, 1955.