Richek, M. A. (2014). The World of words: Vocabulary for college success (Ninth edition, International edition.). Wadsworth Cengage Learning.
Citazione stile Chigago Style (17a edizione)Richek, Margaret Ann. The World of Words: Vocabulary for College Success. Ninth edition, International edition. Australia: Wadsworth Cengage Learning, 2014.
Citatione MLA (9a ed.)Richek, Margaret Ann. The World of Words: Vocabulary for College Success. Ninth edition, International edition. Wadsworth Cengage Learning, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.