National Science Teachers Association. Environmental Inquiry Leadership Team, ebrary, Inc, & Trautmann, N. M. (2001). Assessing toxic risk (Student ed.). NSTA Press.

National Science Teachers Association. Environmental Inquiry Leadership Team, Inc ebrary, and Nancy M. Trautmann. Assessing Toxic Risk. Student ed. Arlington, Va.: NSTA Press, 2001.

National Science Teachers Association. Environmental Inquiry Leadership Team, et al. Assessing Toxic Risk. Student ed. NSTA Press, 2001.