An Overview of Persian Society: a book written by a historian while the other sources may have reliable information, a book on the research topic is usually a good way to start. Books typically get researched by the author and then vetted by a team of editors. A printed book is more likely to contain accurate information than a webpage. A blog can contain accurate information, but the blog “All Cool Persian Stuff” is not written by an expert in the field. Choice “Uncovering the Secrets of Persia” is too narrow for the topic at hand.