Cita APA (7a ed.)

Watcyn-Jones, P., & Howard-Williams, D. (2002). Pair work 1 (New ed.). Pearson Education.

Cita Chicago Style (17a ed.)

Watcyn-Jones, Peter, y Deirdre Howard-Williams. Pair Work 1. New ed. Harlow: Pearson Education, 2002.

Cita MLA (9a ed.)

Watcyn-Jones, Peter, y Deirdre Howard-Williams. Pair Work 1. New ed. Pearson Education, 2002.