ETIQUETTE, ''THE BLUE BOOK OF SOCIAL USAGE'' by Emily Post (American writer) reflects changing customs (“The Vanishing Chaperon and Other New Conventions”). Rules of etiquette encompass most aspects of social interaction in any society, though the term itself is not commonly used. A rule of etiquette may reflect an underlying ethical code, or it may reflect a person's fashion or status. Rules of etiquette are usually unwritten, but aspects of etiquette have been codified from time to time., ISBN13: B0007K9RHK ISBN10: B0007K9RHK Material Type: hardcover