APA-ийн эшлэл(7 дахь хэвлэлт)

Richek, M. A. (1989). The world of words: Vocabulary for college students (2nd ed.). Houghton.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Richek, Margaret Ann. The World of Words: Vocabulary for College Students. 2nd ed. Boston: Houghton, 1989.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Richek, Margaret Ann. The World of Words: Vocabulary for College Students. 2nd ed. Houghton, 1989.