Catherine, K. N., M. W. Njagi, and P. kuria Kamweru. “Effect of Cooperative Mastery Learning Approach on Secondary School Students’ Motivation in Kirinyaga County, Kenya”. The International Journal of Humanities & Social Studies, vol. 9, no. 9, Sept. 2021, doi:10.24940/theijhss/2021/v9/i9/HS2109-045.