Onchoke, George Mogambi, Margret Oloko, and Geoffrey Ongondo Obonyo. 2015. “Influence of Managerial Skills on Performance of Departmental Heads in Public Secondary Schools: A Survey of KISII Central Sub-County”. The International Journal of Business & Management 3 (2). https://internationaljournalcorner.com/index.php/theijbm/article/view/129501.