APA (7th ed.) Citation

Angelou, M. (2002). I know why the caged bird sings. Penguin Books.

Chicago Style (17th ed.) Citation

Angelou, Maya. I Know Why the Caged Bird Sings. Harlow: Penguin Books, 2002.

MLA (8th ed.) Citation

Angelou, Maya. I Know Why the Caged Bird Sings. Penguin Books, 2002.