Cita APA (7a ed.)

Shurter, R. L., & Nichols, F. G. (1948). Effective letters in business. McGraw-Hill Book Co.

Cita Chicago Style (17a ed.)

Shurter, Robert L., y Frederick George Nichols. Effective Letters in Business. New York: McGraw-Hill Book Co, 1948.

Cita MLA (8a ed.)

Shurter, Robert L., y Frederick George Nichols. Effective Letters in Business. McGraw-Hill Book Co, 1948.