The Five Love Languages: How to Express Heartfelt Commitment to Your Mate is a 1992 book by Gary Chapman. It outlines five ways to express and experience love between romantic partners that Chapman calls "love languages.
Getting to Yes: Negotiating Agreement Without Giving In is a best-selling 1981 non-fiction book by Roger Fisher and William L. Ury. Subsequent editions in 1991 and 2011 added Bruce Patton as co-author.
The 48 Laws of Power is a non-fiction book by American author Robert Greene. The book is a bestseller, selling over 1.2 million copies in the United States, and is popular with prison inmates and celebrities.