3DeBerard,M.S.,Spielmans,G.I.,Julka,D.L.Predictors of academic achievement and retention among college freshmen: A longitudinal study[].College Student Journal.2004
4Osseiran-Waines, Nahid,Elmacian, Sarkis.Types of social support: relation to stress and academic achievement among prospective teachers[].Canadian Journal of Behavioural Science.1994