External Amazon affiliate tracking

I have a book which will be published next month and it will be available mainly at Amazon. Many of my joint venture partners are willing to promote the book but I am not sure how we can track to find out who is sending how many customers. I would greatly appreciate your advice.

 

Sign up on ShareASale or something like that if what your talking about is an affiliate thing.

 

Thanks for your reply madmurphy but the book must be sold from Amazon.