Cita APA (7a ed.)

Rein, D. P., & Byrd, D. R. H. (1994). Spectrum: A communicative course in english: workbook. Prentice Hall Regents.

Cita Chicago Style (17a ed.)

Rein, David P., y Donald R. H. Byrd. Spectrum: A Communicative Course in English: Workbook. New Jersey, EUA: Prentice Hall Regents, 1994.

Cita MLA (9a ed.)

Rein, David P., y Donald R. H. Byrd. Spectrum: A Communicative Course in English: Workbook. Prentice Hall Regents, 1994.