Richek, M. A. (1989). The world of words: Vocabulary for college students (2nd ed.). Houghton.
Lua i Stíl Chicago (17ú heag.)Richek, Margaret Ann. The World of Words: Vocabulary for College Students. 2nd ed. Boston: Houghton, 1989.
Lua MLA (9ú heag.)Richek, Margaret Ann. The World of Words: Vocabulary for College Students. 2nd ed. Houghton, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.