Blumenthal, J. C. (1962). English 2600: A programed course in grammar and usage (Rev. ed.). Harcourt, Brace, and World, Inc..
Lua i Stíl Chicago (17ú heag.)Blumenthal, Joseph C. English 2600: A Programed Course in Grammar and Usage. Rev. ed. New York ; Chicago [etc.]: Harcourt, Brace, and World, Inc., 1962.
Lua MLA (8ú heag.)Blumenthal, Joseph C. English 2600: A Programed Course in Grammar and Usage. Rev. ed. Harcourt, Brace, and World, Inc., 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.