APA (7th ed.) Citation

Warshawsky, D., & Byrd, D. R. H. (1983). Spectrum 3: A communicative course in English. Regents Pub.

Chicago Style (17th ed.) Citation

Warshawsky, Diane, and Donald R. H. Byrd. Spectrum 3: A Communicative Course in English. New York: Regents Pub, 1983.

MLA (9th ed.) Citation

Warshawsky, Diane, and Donald R. H. Byrd. Spectrum 3: A Communicative Course in English. Regents Pub, 1983.