Cecil B. Hartley 
Gentlemen’s Book of Etiquette [PDF ebook] 
And Manual of Politeness

Have you ever been confused about the proper pair of gloves to wear while attending a formal luncheon? Would you like to definitively settle the debate about the proper volume at which to carry on conversations with your dining companions? If so, The Gentlemen’s Book of Etiquette should top your reading queue. It offers an interesting look at the manners and conventions of a bygone era, as well as many surprisingly timeless tips for comporting oneself with dignity and grace in all situations.