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.
Fᾰl tiwit ən tanfust musnᾰt ənnes t-addobᾰt ad t-ajj tiẓunawen karaɗᾰt: awa ᾰtiwᾰktabᾰn awa ᾰtwᾰnnᾰn əd awa iɣalasᾰn kᾰl tənfusen kayadᾰn tᾰnᾰt fᾰl karaɗᾰt .