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.
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