Singer, B. (1980). The petting zoo. Raven Books.
Cita Chicago (17th ed.)Singer, Brett. The Petting Zoo. London [etc.]: Raven Books, 1980.
Cita MLA (8th ed.)Singer, Brett. The Petting Zoo. Raven Books, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.