Cita APA (7th ed.)

Rein, D. P., & Byrd, D. R. H. (1994). Spectrum 3: A communicative course in English : workbook (New ed.). Prentice hall Regents.

Cita Chicago (17th ed.)

Rein, David P., i Donald R. H. Byrd. Spectrum 3: A Communicative Course in English : Workbook. New ed. Eaglewood Cliffs,NJ: Prentice hall Regents, 1994.

Cita MLA (8th ed.)

Rein, David P., i Donald R. H. Byrd. Spectrum 3: A Communicative Course in English : Workbook. New ed. Prentice hall Regents, 1994.