APA (7th ed.) Citation

Sadler, R. K., Hayllar, T. A. S., & Powell, C. J. (1980). Language four(4). Macmillan.

Chicago Style (17th ed.) Citation

Sadler, R. K., T. A. S. Hayllar, and C. J. Powell. Language Four(4). South Melbourne ; London: Macmillan, 1980.

MLA (8th ed.) Citation

Sadler, R. K., et al. Language Four(4). Macmillan, 1980.

Warning: These citations may not always be 100% accurate.