A broad range of weblinks for every chapter to further your reading and act as sources.

A short video of interviews with children illustrating Kohlberg’s stages of moral development:
https://www.youtube.com/watch?v=zY4etXWYS84

A talk by Carolyn Webster-Stratton on aggression in young children and how effective intervention can help such children:
https://www.youtube.com/watch?v=ZKiys9BXW0o