Kirn, E., & Hartmann, P. (1990). Interactions 1: A speaking skills book (2nd ed.). New York: McGraw - Hill, Inc.
Trích dẫn kiểu ChicagoKirn, Elaine, và Pamela Hartmann. Interactions 1: A Speaking Skills Book. 2nd ed. New York: McGraw - Hill, Inc, 1990.
MLA CitationKirn, Elaine, và Pamela Hartmann. Interactions 1: A Speaking Skills Book. 2nd ed. New York: McGraw - Hill, Inc, 1990.
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