Cita APA (7a ed.)

Naterop, B. J., Haberfellner, E., & Weis, E. (1980). Business letters for all ([5th. imp].). Oxford University Press.

Cita Chicago Style (17a ed.)

Naterop, Bertha Jean, Eva Haberfellner, y Erich Weis. Business Letters for All. [5th. imp]. Kuala Lumpur: Oxford University Press, 1980.

Cita MLA (9a ed.)

Naterop, Bertha Jean, et al. Business Letters for All. [5th. imp]. Oxford University Press, 1980.