APA (7th ed.) Citation

Perren, G. E. (1968). Teachers of English as a second language: Their training and preparation. Cambridge U.P..

Chicago Style (17th ed.) Citation

Perren, G. E. Teachers of English as a Second Language: Their Training and Preparation. London: Cambridge U.P., 1968.

MLA (8th ed.) Citation

Perren, G. E. Teachers of English as a Second Language: Their Training and Preparation. Cambridge U.P., 1968.