sleep training

Hi guys,
My son is currently used to being rocked to sleep and I want to try a new method where he can slowly get it himself to sleep. I'm not comfortable with the cry it out method. Does anybody have something they read in a book that they could attach here and that I can read? I appreciate all the advice from u guys but I'm more comfortable with stuff that wEre done based on research and are published. Please don't refer me to look online lol if u have something out of a book kindly take a pic and I'll follow it