De Vries, M. A. (1992). Prentice Hall style manual. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)De Vries, Mary Ann. Prentice Hall Style Manual. Englewood Cliffs, N.J: Prentice Hall, 1992.
Lua MLA (9ú heag.)De Vries, Mary Ann. Prentice Hall Style Manual. Prentice Hall, 1992.
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