APA

Shurter R. L., . (1954). Effective letters in business. New York: McGraw-Hill.

Chicago

Shurter Robert L, . 1954. Effective letters in business. New York: McGraw-Hill.

Harvard

Shurter R. L., . (1954). Effective letters in business. New York: McGraw-Hill.

MLA

Shurter Robert L, . Effective letters in business. New York: McGraw-Hill. 1954.