Tanka, J., & Most, P. (1990). Interactions 1: A listening / speaking skills book (2nd ed.). New York: McGraw-Hill publishing company.
Chicago-tyylinen lähdeviittausTanka, Judith, ja Paul Most. Interactions 1: A Listening / Speaking Skills Book. 2nd ed. New York: McGraw-Hill publishing company, 1990.
MLA-viiteTanka, Judith, ja Paul Most. Interactions 1: A Listening / Speaking Skills Book. 2nd ed. New York: McGraw-Hill publishing company, 1990.
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