APA (7th ed.) Citation

Post, E., & Post, E. L. (1975). The new Emily Post's Etiquette. Funk & Wagnalls.

Chicago Style (17th ed.) Citation

Post, Emily, and Elizabeth L. Post. The New Emily Post's Etiquette. New York: Funk & Wagnalls, 1975.

MLA (9th ed.) Citation

Post, Emily, and Elizabeth L. Post. The New Emily Post's Etiquette. Funk & Wagnalls, 1975.