Cita APA (7a ed.)

Rosenthal, I., & Rudman, H. W. (1955). Business letter writing made simple. National Book Store.

Cita Chicago Style (17a ed.)

Rosenthal, Irving, y Harry William Rudman. Business Letter Writing Made Simple. Manila: National Book Store, 1955.

Cita MLA (9a ed.)

Rosenthal, Irving, y Harry William Rudman. Business Letter Writing Made Simple. National Book Store, 1955.