APA
Perren G. E., . (1972). Teachers of English as A Second Language: Their Training and Preparation. London: The English Language Book Society and Cambridge University Press.
Chicago
Perren G E, . 1972. Teachers of English as A Second Language: Their Training and Preparation. London: The English Language Book Society and Cambridge University Press.
Harvard
Perren G. E., . (1972). Teachers of English as A Second Language: Their Training and Preparation. London: The English Language Book Society and Cambridge University Press.
MLA
Perren G E, . Teachers of English as A Second Language: Their Training and Preparation. London: The English Language Book Society and Cambridge University Press. 1972.