If you are marketing and selling products online there is one skill you need to have: the ability to convert a site visitor into a paying customer. You can have the best product in the world, but if you can’t take a site visitor from intrigued viewer to happy customer, your venture won’t survive. Positioning your products for success means you need to improve your knowledge on everything from effective copywriting to data analysis and persona marketing. An excellent way to increase your knowledge base is to become an avid reader of conversion rate optimization books. While there are plenty of options at your disposal, some stand out amongst the myriad of marketing books. Consider adding the following essential CRO books to your list of must-reads for online business owners: