Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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