MCCRIMMON, J. M., TRIMMER, J. F., & SOMMERS, N. I. (1984). Writing with a purpose. -- 8th ed. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)MCCRIMMON, James M., Joseph F. TRIMMER, agus Nancy I. SOMMERS. Writing with a Purpose. -- 8th Ed. Boston: Houghton Mifflin, 1984.
Lua MLA (9ú heag.)MCCRIMMON, James M., et al. Writing with a Purpose. -- 8th Ed. Houghton Mifflin, 1984.
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