APA (7th ed.) Citation

Ayala, F. (1987). Usurpers. Penguin Books.

Chicago Style (17th ed.) Citation

Ayala, Francisco. Usurpers. New York: Penguin Books, 1987.

MLA (9th ed.) Citation

Ayala, Francisco. Usurpers. Penguin Books, 1987.

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