Gaya APA

duPont, M, K. (1990). Business etiquette and professionalism : your guide to career success . Menlo Park, California: Crisp Publications, Inc..

Gaya MLA

duPont, M., Kay. "Business etiquette and professionalism : your guide to career success". Menlo Park, California: Crisp Publications, Inc., 1990. BUKU.