Summers, D. C. S. (2003). Quality (3rd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Summers, Donna C. S. Quality. 3rd ed. Columbus, Ohio: Prentice Hall, 2003.
Lua MLA (8ú heag.)Summers, Donna C. S. Quality. 3rd ed. Prentice Hall, 2003.
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