M. W. Kinyanjui, P. J. Aloka, S. K. Mutisya, F. N. Ndeke, and N. M. Nyang’ara, “Classroom Reinforcement Schedules and Their Effectiveness in Selected Kenyan Primary Schools”, JESR, vol. 5, no. 3, p. 41, Sep. 2015, Accessed: Aug. 11, 2026. [Online]. Available: https://www.richtmann.org/journal/index.php/jesr/article/view/7698