Ng'ang'a, Zipporah W.; Muturi, Ephantus J.; Mbogo, Charles M.; Mwangangi, Joseph M.; Kabiru, Ephantus W.; Mwandawiro, Charles; Beier, John C.(BioMed Central Ltd, 2006)
Ng'ang'a, Zipporah W.; Muok, Erick M. O.; Colley, Daniel G.; Karanja, Diana M. S.; Secor, W. Evan; Gicheru, Michael M.; Carter, Jennifer M.; Black, Carla L.; Mwinzi, Pauline N. M.(American Society of Tropical Medicine and Hygiene, 2009)