Cita APA (7a ed.)

Hutchinson, T., & Ward, A. (1997). Life lines pre-intermediate: Teacher's book.

Cita Chicago Style (17a ed.)

Hutchinson, Tom, y Ann Ward. Life Lines Pre-intermediate: Teacher's Book. Oxford, 1997.

Cita MLA (9a ed.)

Hutchinson, Tom, y Ann Ward. Life Lines Pre-intermediate: Teacher's Book. 1997.