APA (7th ed.) Citation

Ngugi, D., Karau, P. K., & Ngugo, W. (1978). East African agriculture: A textbook for secondary schools. Macmillan.

Chicago Style (17th ed.) Citation

Ngugi, D., P. K. Karau, and W. Ngugo. East African Agriculture: A Textbook for Secondary Schools. London: Macmillan, 1978.

MLA (9th ed.) Citation

Ngugi, D., et al. East African Agriculture: A Textbook for Secondary Schools. Macmillan, 1978.