Lessenberry, D. D., & Crawford, T. J. (1947). 20th century typewriting (4th ed.). South-western Publishing Co..
Lua i Stíl Chicago (17ú heag.)Lessenberry, D. D., agus T. James Crawford. 20th Century Typewriting. 4th ed. [Cincinnati] : [New York, etc.: South-western Publishing Co., 1947.
Lua MLA (8ú heag.)Lessenberry, D. D., agus T. James Crawford. 20th Century Typewriting. 4th ed. South-western Publishing Co., 1947.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.