How to cite primary source that's also featured in a book This is a bit confusing. I'm currently writing a cookbook, and a chef said he would send me one of his restaurant's recipes. When he did, it was in the form of a scan of the recipe as it was featured in another book. So clearly the recipe came from him and I have his permission to use it, but it also exists in this book. Do I cite the chef, or the book, or both for this?
You might write something like "chef X pointed me to this recipe for {dish}: book Y, page Z".