Cita APA (7a ed.)

Williams, A., & Pile, L. (1999). Pass Cambridge BEC 2: Teacher's guide (rev. ed.). Summertown Publishing.

Cita Chicago Style (17a ed.)

Williams, Anne, y Louise Pile. Pass Cambridge BEC 2: Teacher's Guide. rev. ed. Summertown: Summertown Publishing, 1999.

Cita MLA (9a ed.)

Williams, Anne, y Louise Pile. Pass Cambridge BEC 2: Teacher's Guide. rev. ed. Summertown Publishing, 1999.