APA (7th ed.) Citation

Sancho, I., & Carretta, V. (1998). Letters of the late Ignatius Sancho, an African. Penguin Books.

Chicago Style (17th ed.) Citation

Sancho, Ignatius, and Vincent Carretta. Letters of the Late Ignatius Sancho, an African. New York, N.Y.: Penguin Books, 1998.

MLA (9th ed.) Citation

Sancho, Ignatius, and Vincent Carretta. Letters of the Late Ignatius Sancho, an African. Penguin Books, 1998.