APA (7e ed.) Bronvermelding

Percil, J., & Gray, J. (1988). Prospects: An advanced course teacher's book. Penguin Books.

Chicago (17e ed.) Bronvermelding

Percil, John, en Joanna Gray. Prospects: An Advanced Course Teacher's Book. London: Penguin Books, 1988.

MLA (9e ed.) Bronvermelding

Percil, John, en Joanna Gray. Prospects: An Advanced Course Teacher's Book. Penguin Books, 1988.