Keller, D. P., & Thrush, E. A. (1987). Interactions I. A speaking activities book (1a. ed.). Random House.
Citace podle Chicago (17th ed.)Keller, Deborah Poole, a Emity Austin Thrush. Interactions I. A Speaking Activities Book. 1a. ed. Nueva York: Random House, 1987.
Citace podle MLA (9th ed.)Keller, Deborah Poole, a Emity Austin Thrush. Interactions I. A Speaking Activities Book. 1a. ed. Random House, 1987.
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