Keller, D. P., & Thrush, E. A. (1987). Interactions 1: A speaking activities book. New York: Random House.
Trích dẫn kiểu ChicagoKeller, Deborah Poole, và Emily Austin Thrush. Interactions 1: A Speaking Activities Book. New York: Random House, 1987.
Deismireacht MLAKeller, Deborah Poole, và Emily Austin Thrush. Interactions 1: A Speaking Activities Book. New York: Random House, 1987.
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