I am pretty new to the topic and just finished
A. Razak Abdel-Kader's
Conflicts between Jews and Arabs, as one of my first books on the topic. He mentions more than 3/4 of Arabs left in 1948, who became afraid following fake news of threats from Jews at this moment. He mentions Jews asked them to stay despite those news, that this state would not be able to survive without them.
By trying to learn more about it, I came across the historian
Ilan Pappé wiki, mentioning Arabs were mainly fleeing fights. An other historian,
Benny Morris explains it was deliberate from the Jews.
The two wikis mention sources from Israeli archives and Ben Gurion's letter. So where can I find sources going deeper than this and why is it so hard to find the truth?