APA (7th ed.) Citation

Costinett, S., & Byrd, D. R. V. (1993). Spectrum: A communicative course in english 2B (1ª ed.).

Chicago Style (17th ed.) Citation

Costinett, Sandra, and Donald R. Veltfort Byrd. Spectrum: A Communicative Course in English 2B. 1ª ed. London, 1993.

MLA (9th ed.) Citation

Costinett, Sandra, and Donald R. Veltfort Byrd. Spectrum: A Communicative Course in English 2B. 1ª ed. 1993.