References
- Hidi, S., and S.A. Renninger. 2006. The four-phase model of interest development. Educational Psychologist 41 (2): 111–27. www.informalscience.org/four-phase-model-interest-development.
- National Research Council (NRC). 2009. Learning science in informal environments: People, places, and pursuits. Washington, DC: National Academies Press. www.nap.edu/catalog/12190/learning-science-in-informal-environments-people-places-and-pursuits.