Dellar, H., & Walkley, A. (2016). Outcomes: Intermediate Student's Book (second edition.). National Geographic Learning; Cengage Learning.
Chicago Style (17. basım) AtıfDellar, Hugh, ve Andrew Walkley. Outcomes: Intermediate Student's Book. second edition. United Kingdom: National Geographic Learning; Cengage Learning, 2016.
MLA (9th ed.) AtıfDellar, Hugh, ve Andrew Walkley. Outcomes: Intermediate Student's Book. second edition. National Geographic Learning; Cengage Learning, 2016.
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