Etiquette in Society, in Business, in Politics, and at Home (frequently referenced as Etiquette) is a book authored by Emily Post in 1922. The book covers manners and other social rules, and has been updated frequently to reflect social changes, such as diversity, redefinitions of family, and mobile technology. The 19th edition of Etiquette (2017), is authored by Post's descendants Lizzie Post and Daniel Post Senning.