The Pay-per-Click Search Engine Handbook by Boris and Eugene Mordkovich ($19.97) is an excellent read for small to medium-sized business owners as well as marketers within larger companies looking to understand the pay-per-click (PPC) search engine universe. The 195 page book covers the history of search engine marketing as well as PPC strategies, tools, tips and resources. Simply put, it’s the definitive PPC guide for marketers and business owners.