Cita APA (7a ed.)
Lessenberry, D., Crawford, T. J., & Erickson, L. W. 20th Century Typewriting: Complete Course. South-Western.
Cita estilo Chicago (17a ed.)
Lessenberry, D.D, T. James Crawford, y Lawrence W. Erickson. 20th Century Typewriting: Complete Course. Nueva York, EUA: South-Western.
Cita MLA (9a ed.)
Lessenberry, D.D, et al. 20th Century Typewriting: Complete Course. South-Western.
Precaución: Estas citas no son 100% exactas.