Cita APA (7th ed.)

Tietz, R. (1984). Complete book of effective personal letters. Prentice-Hall.

Cita Chicago (17th ed.)

Tietz, Robert. Complete Book of Effective Personal Letters. Englewood Cliffs, N. J: Prentice-Hall, 1984.

Cita MLA (9th ed.)

Tietz, Robert. Complete Book of Effective Personal Letters. Prentice-Hall, 1984.