APA引文

Lessenberry, D. D., & Crawford, T. J. (1947). 20th century typewriting (4th ed.). South-western Publishing Co..

Chicago Style (17th ed.) Citation

Lessenberry, D. D., and T. James Crawford. 20th Century Typewriting. 4th ed. [Cincinnati] : [New York, etc.: South-western Publishing Co., 1947.

MLA引文

Lessenberry, D. D., and T. James Crawford. 20th Century Typewriting. 4th ed. South-western Publishing Co., 1947.