Currently, the book is beyond my reach (In car in shop), so I cannot directly quote anything. However, the main part of the first chapter in the book is dedicated to how he finds his information. His sources are “Primary Sources”, meaning the actual archeological evidence. Letters, Carvings, Ancient Books, Pottery, Journals ect. When he has to, meaning he cannot find any primary sources on the subject, he will resort to “Secondary Sources”, meaning compiling of information that were made during the time period (Almanacs, Encyclopedias, their ancient equivilants, ect).
And note I cited sources above. I will however cite more for the information I have postd since. I still have yet to hear a single decent arguement against Columbus day.