Gaya APA

Hawkey, R. et al (2006). Impact Theory and Practice : Studies Of The IELTS Test And Progetto Lingue 2000 . New York: Cambridge University Press.

Gaya MLA

Hawkey, Roger. et al. "Impact Theory and Practice : Studies Of The IELTS Test And Progetto Lingue 2000". New York: Cambridge University Press, 2006. Text.