1. A model of human motivation for sociology;Alsted;New York: P. Lang.,2005
2. Social research methods;Bryman;Oxford: Oxford University Press.,2012
3. The foundations of social research: Meaning and perspective in the research process;Crotty;London: Sage Publications.,1998
4. Student Council, Volunteering;Eccles;Basketball, or Marching Band: What Kind of Extracurricular Involvement Matters?. Journal of adolescent research,1999
5. Student engagement: What is it?;Finn;Why does it matter?. Handbook of research on student engagement. US: Springer,2012