Kuria, David Ndegwa; Felix N. Mutua; Craig Von Hagen(2011 International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 2011-01)
Macharia, Mary Wandia; Gachari, Moses Karoki; Mariita, Nicholas Obuya; Mundia, Charles N.; Kuria, David Ndegwa(Journal of Applied Sciences, Engineering and Technology for Development. JASETD, 2018-04)