Cita APA (7a ed.)

Naterop, B. J., Weis, E., & Haberfellner, E. (1993). Business letters for all. Oxford University Press.

Cita Chicago Style (17a ed.)

Naterop, Bertha J., Erich Weis, y Eva Haberfellner. Business Letters for All. Oxford: Oxford University Press, 1993.

Cita MLA (9a ed.)

Naterop, Bertha J., et al. Business Letters for All. Oxford University Press, 1993.