Warshawsky, D. (1983). Spectrum 4: A communicative course in English. Prentice Hall Regents.
Chicagoスタイル(17版)引用形式Warshawsky, Diane. Spectrum 4: A Communicative Course in English. London: Prentice Hall Regents, 1983.
MLA(9版)引用形式Warshawsky, Diane. Spectrum 4: A Communicative Course in English. Prentice Hall Regents, 1983.
警告: この引用は必ずしも正確ではありません.