Warshawsky, D. (1983). Spectrum 3: A communicative course in english. Prentice Hall Regents.
Cita Chicago Style (17a ed.)Warshawsky, Diane. Spectrum 3: A Communicative Course in English. London: Prentice Hall Regents, 1983.
Cita MLA (9a ed.)Warshawsky, Diane. Spectrum 3: A Communicative Course in English. Prentice Hall Regents, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.