Cita APA (7th ed.)

Costinett, S. (1985). Spectrum 5: A communicative course in english. Prentice Hall Regents.

Cita Chicago (17th ed.)

Costinett, Sandra. Spectrum 5: A Communicative Course in English. London: Prentice Hall Regents, 1985.

Cita MLA (9th ed.)

Costinett, Sandra. Spectrum 5: A Communicative Course in English. Prentice Hall Regents, 1985.