APA (7th ed.) Citation

Aziz, A., & Beckett, B. S. (1985). O level tropical biology. Oxford University Press.

Chicago Style (17th ed.) Citation

Aziz, Afzal, and B. S. Beckett. O Level Tropical Biology. Oxford: Oxford University Press, 1985.

MLA (9th ed.) Citation

Aziz, Afzal, and B. S. Beckett. O Level Tropical Biology. Oxford University Press, 1985.