Njunwa, K. ., Mwaiko , G., Kilonzo, B., & Mhina, J. . (1985). Studies on the Seasonal Patterns of Rodent, Flea and Plague Outbreaks in the Western Usambara Mountains, North-East Tanzania. Tanzania Veterinary Journal, 7(2), 16–27. Retrieved from http://tvj.sua.ac.tz/vet2/index.php/TVJ/article/view/305