Loya, E., Josephson, K., Pepper, I. L., Gerba, C. P., & Brusseau, M. L. (2006). Environmental & pollution science (2nd ed.). Burlington, MA: Elsevier/Academic Press.

Loya, E.R, K.L Josephson, Ian L. Pepper, Charles P. Gerba, and Mark L. Brusseau. Environmental & Pollution Science. 2nd ed. Burlington, MA: Elsevier/Academic Press, 2006.

Loya, E.R, et al. Environmental & Pollution Science. 2nd ed. Burlington, MA: Elsevier/Academic Press, 2006.