APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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