He has also authored ten textbooks in Agriculture and Biology for Kenya and Malawi. Isaac is a BSc graduate from Egerton University and a holder of Postgraduate Diploma in Education (PGDE) from Kenyatta University.
27. Mkunga: Awasaidiaye wajawazito kujifungua. 28. Kungwi: Afundishaye mwari wa kike au kiume.