1. AllenI.E.SeamanJ.Making the grade: Online education in the United States Sloan-CNeedham MA2006
2. AllyM.Foundations of educational theory for online learningThe theory and practice of online learningAndersonT. Athabasca University PressEdmonton CA2004 1544
3. BanduraA.Social foundations of thought and action: A social cognitive theory Prentice-HallEnglewood Cliffs NJ1986
4. BanduraA.Self-efficacy: The exercise of control FreemanNew York1997
5. Centers for Disease Control and PreventionNational vital statistics system 2009 http://www.cdc.gov/nchs/births.htm