APA Style

Naterop, B, J. et al (1986). Business Letters for All / Bertha J. Naterop, Erich Weis and Eva Haberfellner (13). Oxford: Oxford University Press.

MLA Style

Naterop, Bertha, J.. et al. "Business Letters for All / Bertha J. Naterop, Erich Weis and Eva Haberfellner". 13 Oxford: Oxford University Press, 1986. Textbook ห้องสมุดทั่วไป.