While writing my masters thesis I've come across some great readings. Most are just out so the topic seems hot these days.
The new book by Henry Chesbrough, "the father of open innovation", Open Services Innovation: Rethinking Your Business to Grow and Compete in a New Era is an amazing book all people interested in services should read. I especially liked the way H.C. manages to reflect on micro and macro environments and small and large organizations. Another book that caught my attention was a book edited by Paul Sloane:
A Guide to Open Innovation and Crowdsourcing: Advice From Leading Experts. Insights from many of the leading international writers on the topics of open innovation and crowdsourcing. Packed with case studies and advices to service companies, it's all in all a great book.