Cita APA

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

Citación estilo Chicago

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

Cita MLA

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