Cita APA (7a ed.)

Collins, A., & Hornby, N. (2003). About a boy. Penguin books.

Cita Chicago Style (17a ed.)

Collins, Anne, y Nick Hornby. About a Boy. London: Penguin books, 2003.

Cita MLA (9a ed.)

Collins, Anne, y Nick Hornby. About a Boy. Penguin books, 2003.