I've been hired to write an e-book. It's kind of a how-to and the person who hired me put together the outline and general layout and I am writing the core content. I am getting (under)paid, but most important to me right now is getting a credit. However, I'm not sure what credit to ask for. It's not strictly a by-line because she's providing things. Would it be co-author? Would we put "By her and me" ?? Thank you!