Withrow, J. 1. (1987). Effective writing: Writing skills for intermediate students of American English : student’s book. Cambridge [Cambridgeshire]: Cambridge University Press.
Chicago-tyylinen lähdeviittausWithrow, Jean 1937-. Effective Writing: Writing Skills for Intermediate Students of American English : Student’s Book. Cambridge [Cambridgeshire]: Cambridge University Press, 1987.
MLA-viiteWithrow, Jean 1937-. Effective Writing: Writing Skills for Intermediate Students of American English : Student’s Book. Cambridge [Cambridgeshire]: Cambridge University Press, 1987.
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