In the chapter, "The Social History of Satan," referenced are three accounts of the angelic rebellion:
1. One angel was insubordinate to his commander, referring to Isa. 14:12-15*
2. Lustful "sons of God" mated with human women producing monstrous offspring. These stories derive from Genesis 6**
3. God ordered his angels to admire and bow down to his work of Adam, their younger sibling - Michael obeyed, but Satan refused (from an apocryphal version of the life of Adam and Eve).
"...that this greatest and most dangerous enemy did not originate, as one might expect, as an outsider, an alien, or a stranger. Satan is not the distance enemy but the intimate enemy - one's trusted colleague, close associate, brother." 
*Isaiah 14:12-15
12 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
13 For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north:
14 I will ascend above the heights of the clouds; I will be like the most High.
15 Yet thou shalt be brought down to hell, to the sides of the pit.
**Genesis 6:1-7 The Wickedness of Man
(KJV, biblehub.com)