Cita APA (7a ed.)

Abrams, S., & Rein, D. P. B. (1986). Spectrum 2: A communicative course in English. SGEL : Regents Publishing Company.

Cita Chicago Style (17a ed.)

Abrams, Sharon, y David P. Byrd Rein. Spectrum 2: A Communicative Course in English. New York: SGEL : Regents Publishing Company, 1986.

Cita MLA (9a ed.)

Abrams, Sharon, y David P. Byrd Rein. Spectrum 2: A Communicative Course in English. SGEL : Regents Publishing Company, 1986.