Dreyling, E, Dederick, EJ, Chari, R, Resnick, B, Malecki, KC, Burke, T, and Neff, Roni A. 2007.
Tracking health and the environment: a pilot test of environmental public health indicators 70, no. 5. Journal of environmental health: 9 - 16, 38, 40; quiz 41-2.