Richek, M. A. (2008). The world of words: Vocabulary for college success (Seventh edition.). Heinle Cengage Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRichek, Margaret Ann. The World of Words: Vocabulary for College Success. Seventh edition. Australia: Heinle Cengage Learning, 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRichek, Margaret Ann. The World of Words: Vocabulary for College Success. Seventh edition. Heinle Cengage Learning, 2008.
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