The Origins of Shirk - by Shaik Nasiruddin Albanee [Book] -It has been related by a group from the Salaf (Pious Predecessors) in many narrations, that these five deities were righteous worshippers. However, when they died, Shaytaan (Satan) whispered into their people to retreat and sit at their graves. Then Shaytaan whispered to those who came after them that they should take them as idols, beautifying to them the idea that you will be reminded of them and thereby follow them in righteous conduct. Then Shaytaan suggested to the third generation that they should worship these idols besides Allah - the most high - and he whispered to them that this is what their forefathers used to do...
Aspects of Days of Ignorance - Shaykhul Islaam Muhammad Ibn ’Abdul-Wahhaab [Book] [pdf] This is a translation of the classical treatise of Imaam Muhammad bin ‘Abdil-Wahhaab “Masaa’il-ul-Jaahiliyyah” (Aspects of the Days of Ignorance), which is a list of 128 points - each point representing one aspect of belief or practice that the people of the Days of Ignorance were upon, which Islaam came to oppose.