National Research Council. (2009). Introduction. Chapters 1 and 2 in Committee on Learning Science in Informal Environments, Learning Science in Informal Environments: People, Places, and Pursuits. P. Bell, B. Lewenstein, A.W. Shouse, and M.A. Feder (Eds.). Center for Education, Division of Behavioral and Social Sciences and Education. Washington, DC: The National Academies Press.
Yager, R.E., and Falk, J. (Eds.). (2008). Exemplary Science in Informal Education Settings: Standards-Based Success Stories. Arlington, VA: NSTA Press.
Center for the Advancement of Informal Science Education (CAISE): http://caise.insci.org/
Citizen Science: http://www.citizenscience.org