Lessenberry, D. D. (1942). 20th century typewriting (4th ed.). South-western Pub. Co..
Lua i Stíl Chicago (17ú heag.)Lessenberry, D. D. 20th Century Typewriting. 4th ed. Cincinnati : New York [etc.]: South-western Pub. Co., 1942.
Lua MLA (8ú heag.)Lessenberry, D. D. 20th Century Typewriting. 4th ed. South-western Pub. Co., 1942.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.