In terms of marketing I would suggest "The Art Of Thinking Clearly" by Rolf Dobelli, it has a lot of things written there about our psychology, which can be practically used in IM.
If we are talking about exact person, for example, any of your friends I think it is useless to try to change their mindset, I mean you can try to help them out and support, but if person does not want to do anything you talk or want them to do - it's quite useless to even try because at the end of the day he will be doing thing that he wants and thing that drives him. If you want to motivate person to get into something you think is useful for him - it's just waste of your time. In my opinion you can only give them some useful links, info and if they will want to do things - they will do it. Elon Musk once said "if you need inspirational words to do it - don't do it". And I think it is absolutely true.