APA (7th ed.) Zitazioa
Sinclair, C. (2010). Grammar: A friendly approach (2nd ed.). McGraw-Hill : Open University Press.
Chicago Style (17th ed.) Zitazioa
Sinclair, Christine. Grammar: A Friendly Approach. 2nd ed. Berkshire, England ; New York, N.Y.: McGraw-Hill : Open University Press, 2010.
MLA (9th ed.) Zitazioa
Sinclair, Christine. Grammar: A Friendly Approach. 2nd ed. McGraw-Hill : Open University Press, 2010.
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