Dr. Tabitha Wangeri and Lumumba Wilfred Okello, “Role Overload, Teacher-Pupil-Ratio, School Type, Years of Teaching Experience, Gender and Burn Out as Factors Related to Work Stress among Primary School Teachers in Kasarani Division, Nairobi County, Kenya”, GJHSS, vol. 14, no. G1, pp. 55–63, Jan. 2014.