1. The challenger story 〈http://www.challenger.org/about/history/index.cfm〉, 2008 (31 July 2008).
2. NASA Explorer Schools (2003 cohort): case study reports and summary rubric scores 〈http://www.cet.edu/pdf/2003_Case_Studies.pdf〉, May 2007 (31 July 2008).
3. Iowa Mathematics and Science Coalition (ISMC) 〈http://www.imsconline.org/links.cfm〉, 2008 (31 July 2008).
4. NASA Explorer Schools 〈http://explorerschools.nasa.gov/portal/site/nes/〉, 2008 (26 August 2008).
5. NASA Explorer Schools 〈http://www7.nationalacademies.org/bose/NASA_3_Presentation_LaSalvia.ppt〉, 2008 (1 August 2008).