1. Beck, A.M. 1973.The Ecology of Stray Dogs: A Study of Free Ranging Urban Animals.Baltimore: York Press.
2. Dean, A.G., Dean, S.A., Coulumbier, D., Brendel, K.A., Smith, D.C., Burton, A.H., Dicker, R.C., Sulliva, K., Fagan, R.F. and Arner, T.G. 1994. Epilnfo, Version processing, database and statistics program for epidemiology on microcomputer for Disease Control and Prevention, Atlanta, Georgia.