Kohlberg´s theory was groundbraking, so we recommend not to be satisfied with just the basics, but to get more information about it - for example, at the link below:
Developmental Psychology
Kohlberg´s theory of moral development
Crain, W. C. (1985). Theories of development. Prentice-Hall. pp. 118-136. (chapter seven)
Retrieved from: http://www.polsci.tu.ac.th/lawrence.pdf Compulsory reading: 1-8, 12, 13, 16-18
Extra materials