Collective Behavior - Crowds

Summary

A crowd is a gathering of people who share a purpose or intent and influence one another.Crowds are a common occurrence in modern life. we can differentiated four types of crowds like casual, conventional, expressive, acting.
When crowd behavior is directed toward a specific, violent end, the result is a mob . Riots do not have a specific end, it is assumed that their intention is to express general dissatisfaction. Collective behavior can also refer to behavior that is diffused or dispersed over large distances. Originally proposed by Gustave LeBon (1896), contagion theory proposes that crowds exert a hypnotic influence on their members. The hypnotic influence, combined with the anonymity of belonging to a large group of people, results in irrational, emotionally charged behavior. Convergence theory argues that the behavior of a crowd is not an emergent property of the crowd but is a result of like-minded individuals coming together. Emergent-Norm Theory combines the above two theories, arguing that it is a combination of like-minded individuals, anonymity, and shared emotion that leads to crowd behavior.

Opinion

I learned about crowds in detail. I learned crowds theory when I 'm high school student, but I couldn't learn in detail. So this wikibook is very useful to me. But I can't know about LeBon' s  theory. I want to know LeBon theory in detail. How can I find about LeBon theory?