> if you talk about a book this book is the primary source and everything else is not Just to add here - it's a primary source if you're talking about the book

> if you talk about a book this book is the primary source and everything else is not Just to add here - it's a primary source if you're talking about the book and it's discussing a new idea of some sort or events they themselves saw - if it's a history book and you're using the book to understand the events it's describing which the author is interpreting by their having read other sources (e.g. first hand accounts of the event), the books itself isn't a primary source. Otherwise I agree with what you're saying.