Cita APA (7a ed.)

Ford, B. G., & Williams, S. (2013). No more biting for billy goat! Boxer Books.

Cita Chicago Style (17a ed.)

Ford, Bernette G., y Sam Williams. No More Biting for Billy Goat! [S.I.]: Boxer Books, 2013.

Cita MLA (8a ed.)

Ford, Bernette G., y Sam Williams. No More Biting for Billy Goat! Boxer Books, 2013.

Precaución: Estas citas no son 100% exactas.