In general, the sources of historical knowledge can be separated into three categories: what is written, what is said, and what is physically preserved, and historians often consult all three.
Sané  sampun ketah, manut unteng-unteng kaweruhan indik sejarah prasida kapahang dados tigang parindikan; napi sané  kasurat, napi sané  kabaosang, miwah napi sané  kawrediang ring sajeroning fisiknyane, miwah sejarawan sering pisan mabligbagan ngenénin indik tigang parindikan punika.