Percil, J., & Gray, J. (1988). Prospects: An advanced course teacher's book. Penguin Books.
Style de citation Chicago (17e éd.)Percil, John, et Joanna Gray. Prospects: An Advanced Course Teacher's Book. London: Penguin Books, 1988.
Style de citation MLA (9e éd.)Percil, John, et Joanna Gray. Prospects: An Advanced Course Teacher's Book. Penguin Books, 1988.
Attention : ces citations peuvent ne pas être correctes à 100%.