APA (7th ed.) Citation

Henderson, S., & Gray, J. (1981). Discovering English: Teacher's book. Cassell.

Chicago Style (17th ed.) Citation

Henderson, Susan, and Joanna Gray. Discovering English: Teacher's Book. London: Cassell, 1981.

MLA (9th ed.) Citation

Henderson, Susan, and Joanna Gray. Discovering English: Teacher's Book. Cassell, 1981.