Ferree, T., & Sanabria, K. (1998). NorthStar: Focus on listening and speaking, high intermediate. Longman.
Citace podle Chicago (17th ed.)Ferree, Tess, a Kim Sanabria. NorthStar: Focus on Listening and Speaking, High Intermediate. Nueva York: Longman, 1998.
Citace podle MLA (9th ed.)Ferree, Tess, a Kim Sanabria. NorthStar: Focus on Listening and Speaking, High Intermediate. Longman, 1998.
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