Cita APA (7a ed.)

Naterop, B. J., Weis, E., & Haberfellner, E. (1984). Business letters for all (9th imp.). Oxford University Press.

Cita Chicago Style (17a ed.)

Naterop, B. Jean, Erich Weis, y Eva Haberfellner. Business Letters for All. 9th imp. Kuala Lumpur ; Oxford: Oxford University Press, 1984.

Cita MLA (9a ed.)

Naterop, B. Jean, et al. Business Letters for All. 9th imp. Oxford University Press, 1984.