Cita APA

Warshawsky, D., & Byrd, D. R. H. (1994). Spectum: A communicative course in English. Englewood Cliffs, NJ: Prentice Hall Regents.

Chicago Style Citation

Warshawsky, Diane., i Donald R. H. Byrd. Spectum: A Communicative Course in English. Englewood Cliffs, NJ: Prentice Hall Regents, 1994.

Cita MLA

Warshawsky, Diane., i Donald R. H. Byrd. Spectum: A Communicative Course in English. Englewood Cliffs, NJ: Prentice Hall Regents, 1994.