Costinett, S. (1985). Spectrum 5: A communicative course in english. Prentice Hall Regents.
Cita Chicago Style (17a ed.)Costinett, Sandra. Spectrum 5: A Communicative Course in English. London: Prentice Hall Regents, 1985.
Cita MLA (9a ed.)Costinett, Sandra. Spectrum 5: A Communicative Course in English. Prentice Hall Regents, 1985.
警告:這些引文格式不一定是100%准確.