Cita APA (7th ed.)

Pye D. Diana & Greenall S. Simon. (1997). Reward. Elementary; Practice Book. Oxford, Heinemann, 1997.

Cita Chicago (17th ed.)

Pye D. Diana i Greenall S. Simon. Reward. Elementary; Practice Book. Oxford, Heinemann, 1997, 1997.

Cita MLA (9th ed.)

Pye D. Diana i Greenall S. Simon. Reward. Elementary; Practice Book. Oxford, Heinemann, 1997, 1997.