Ng'ang'a, Zipporah W.; Barasa, M.; Sowayi, G. A.; Okoth, J. M.; Barasa, M. B. O.; Namulanda, F. B. M.; Kagasi, E. A.; Gicheru, M. M.; Ozwara, S. H.(National Authority for Scientific Research &, 2012)
Ng'ang'a, Zipporah W.; Maina, Alice N.; Knobel, Darryn L.; Jiang, Ju; Halliday, Jo; Feikin, Daniel R.; Cleaveland, Sarah; Junghae, Muthoni; Breiman, Robert F.; Richards, Allen L.; Njenga, M. Kariuki(Centers for Disease Control and Prevention, 2012)