Cita APA (7a ed.)

Warshawsky, D. B. (1983). Spectrum 3: A communicative course in English. Prentice-Hall.

Cita Chicago Style (17a ed.)

Warshawsky, Diane Byrd. Spectrum 3: A Communicative Course in English. Englewood Cliffs, New Jersey: Prentice-Hall, 1983.

Cita MLA (9a ed.)

Warshawsky, Diane Byrd. Spectrum 3: A Communicative Course in English. Prentice-Hall, 1983.