Gaya APA

Haberfellner, B, J, N, E, W, E. (1997.0). Busniness Letters For All . : Exford University Press.

Gaya MLA

Haberfellner, Bertha, J., Naterop, Erich, Weis, Eva. "Busniness Letters For All". : Exford University Press, 1997.0. Text.