Cita APA (7a ed.)

Lessenberry, D. D. (1942). 20th century typewriting (4th ed.). South-western Pub. Co..

Cita Chicago Style (17a ed.)

Lessenberry, D. D. 20th Century Typewriting. 4th ed. Cincinnati : New York [etc.]: South-western Pub. Co., 1942.

Cita MLA (8a ed.)

Lessenberry, D. D. 20th Century Typewriting. 4th ed. South-western Pub. Co., 1942.