Peterson, P. W. (2003). Developing writing: Writing skills practice book for EFL : beginning/intermediate level. United States Department of State.
Chicago-viite (17. p.)Peterson, Patricia Wilcox. Developing Writing: Writing Skills Practice Book for EFL : Beginning/intermediate Level. Washington, DC: United States Department of State, 2003.
MLA-viite (9. p.)Peterson, Patricia Wilcox. Developing Writing: Writing Skills Practice Book for EFL : Beginning/intermediate Level. United States Department of State, 2003.
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