Walters, R. G. (1949). Workbook for Word studies (3rd edition.). South-Western Publishing Company.
Lua i Stíl Chicago (17ú heag.)Walters, R. G. Workbook for Word Studies. 3rd edition. Cincinnati, Ohio: South-Western Publishing Company, 1949.
Lua MLA (8ú heag.)Walters, R. G. Workbook for Word Studies. 3rd edition. South-Western Publishing Company, 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.