Cita APA (7a ed.)

Pile, L., & Williams, A. (2002). Pass cambridge BEC Preliminary [CD-ROM]: Self-study practice tests with key. Summertown Publishing.

Cita Chicago Style (17a ed.)

Pile, Louise, y Anne Williams. Pass Cambridge BEC Preliminary [CD-ROM]: Self-study Practice Tests with Key. Summertown: Summertown Publishing, 2002.

Cita MLA (9a ed.)

Pile, Louise, y Anne Williams. Pass Cambridge BEC Preliminary [CD-ROM]: Self-study Practice Tests with Key. Summertown Publishing, 2002.