APA (7th ed.) Citation

Yapp, N. (1994). Debrett's guide to business etiquette: The complete book of modern business practice and etiquette. Headline.

Chicago Style (17th ed.) Citation

Yapp, Nicholas. Debrett's Guide to Business Etiquette: The Complete Book of Modern Business Practice and Etiquette. London: Headline, 1994.

MLA (9th ed.) Citation

Yapp, Nicholas. Debrett's Guide to Business Etiquette: The Complete Book of Modern Business Practice and Etiquette. Headline, 1994.