Kipfer, B. A. (1993). Roget's 21st century thesaurus. New York: The Philip Lief Group.
Trích dẫn kiểu ChicagoKipfer, Barbara Ann. Roget's 21st Century Thesaurus. New York: The Philip Lief Group, 1993.
Deismireacht MLAKipfer, Barbara Ann. Roget's 21st Century Thesaurus. New York: The Philip Lief Group, 1993.
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