Cita APA (7th ed.)

Frailey, L. (1982). Handbook of business letters (2nd.). Super book house.

Cita Chicago (17th ed.)

Frailey, L. Handbook of Business Letters. 2nd. Bombay: Super book house, 1982.

Cita MLA (9th ed.)

Frailey, L. Handbook of Business Letters. 2nd. Super book house, 1982.