Marketing for ecommerce is they key – the books here that are show are ‘true’ marketing books – however a much better and deeper context for marketing can be established via Psychology and Sociology books.  I have split those up into separate sections, BUT, I believe that a true marketer gets into the ‘head’ of their customers – understands their motives, thinking, challenges, issues.   Sociology and Psychology allow you to synthesize your own ideas beyond what a ‘marketing’ book would tell you.