Mganga, Kevin Z.; Musimba, Nashon K. R.; Nyangito, Moses M.; Nyariki, Dickson M.; Mwang’ombe, Agnes W.; Ekaya, Wellington N.; Muiru, William M.(2010-09)
Musimba, Nashon K. R.; Aredo, Tesfaye A.; Mbuvi, David M.(The African Pastoral Forum Pastoral Information Network Programme and University of Nairobi, 1998)