APA-referens (7:e uppl.)

Perrn, G. E. (1968). Teachers of English as a second language: Their training and preparation. University Press.

Chicago-referens (17:e uppl.)

Perrn, G. E. Teachers of English as a Second Language: Their Training and Preparation. Cambridge: University Press, 1968.

MLA-referens (8:e uppl.)

Perrn, G. E. Teachers of English as a Second Language: Their Training and Preparation. University Press, 1968.