Reference

1. Differential reinforcement theory, criminology wiki

http://criminology.wikia.com/wiki/Differential_Reinforcement_Theory%28Akers%29

2. Anthony Walsh(2012), Criminology,p.79

3. Ross Lawrence(1983), Determinants of delinquency: A Longitudinal Analysis of Social Control and Differential Association Theories p.15

4. Ross Lawrence(1983), Determinants of delinquency: A Longitudinal Analysis of Social Control and Differential Association Theories, Ross Lawrence, p.16

5. Ross Lawrence(1983), Determinants of delinquency: A Longitudinal Analysis of Social Control and Differential Association Theories p.17

6. Strain theory(sociology), Wikipedia

http://en.wikipedia.org/wiki/Strain_theory_(sociology)

7. Anthony Walsh(2012), Criminology,p.120