Cita APA (7th ed.)

Stephenson, P. (2001). Billy. HarperCollinsEntertainment.

Cita Chicago (17th ed.)

Stephenson, Pamela. Billy. Londres: HarperCollinsEntertainment, 2001.

Cita MLA (9th ed.)

Stephenson, Pamela. Billy. HarperCollinsEntertainment, 2001.

Atenció: Aquestes cites poden no estar 100% correctes.