Cita APA (7th ed.)

Kenny, N., & kelly, A. (2005). Ready for PET. Macmillan Heinemann.

Cita Chicago (17th ed.)

Kenny, Nick, i Anne kelly. Ready for PET. España: Macmillan Heinemann, 2005.

Cita MLA (9th ed.)

Kenny, Nick, i Anne kelly. Ready for PET. Macmillan Heinemann, 2005.