Luusa, J., J. Obara, and S. Wambugu. “Effectiveness of Farmer Field School Training in Promoting Adoption of Best Agricultural Practices by Smallholder Coffee Farmers in Kenya”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 41, no. 1, Aug. 2018, pp. 116-32, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9160.