Williams, A., Pile, L., & Lloyd Jones, C. (2000). Pass Cambridge BEC 3: Teacher's guide. Summertown Publishing.
Cita Chicago Style (17a ed.)Williams, Anne, Louise Pile, y Catrin Lloyd Jones. Pass Cambridge BEC 3: Teacher's Guide. Summertown: Summertown Publishing, 2000.
Cita MLA (9a ed.)Williams, Anne, et al. Pass Cambridge BEC 3: Teacher's Guide. Summertown Publishing, 2000.
Precaución: Estas citas no son 100% exactas.