APA (7th ed.) Citation

Naterop, B. J., Weis, E., & Haberfellner, E. (1991). Business letters for all. Oxford University Press.

Chicago Style (17th ed.) Citation

Naterop, Bertha J., Erich Weis, and Eva Haberfellner. Business Letters for All. Oxford University Press, 1991.

MLA (8th ed.) Citation

Naterop, Bertha J., et al. Business Letters for All. Oxford University Press, 1991.