Cita APA (7a ed.)

Pile, L., & Williams, A. (2002). Pass cambridge BEC Preliminary: An examination preparation course updated for the revised exam : practice tests. Summertown Publishing.

Cita Chicago Style (17a ed.)

Pile, Louise, y Anne Williams. Pass Cambridge BEC Preliminary: An Examination Preparation Course Updated for the Revised Exam : Practice Tests. Summertown: Summertown Publishing, 2002.

Cita MLA (9a ed.)

Pile, Louise, y Anne Williams. Pass Cambridge BEC Preliminary: An Examination Preparation Course Updated for the Revised Exam : Practice Tests. Summertown Publishing, 2002.