Watkins, F. C., & Dillingham, w. B. (1989). Practical English handbook (8th ed., Instructor's annotated ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Watkins, Floyd C., agus william B. Dillingham. Practical English Handbook. 8th ed., Instructor's annotated ed. Boston, MA: Houghton Mifflin, 1989.
Lua MLA (9ú heag.)Watkins, Floyd C., agus william B. Dillingham. Practical English Handbook. 8th ed., Instructor's annotated ed. Houghton Mifflin, 1989.
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