1. The tree-thinking challenge;Baum;Science,2005
2. The role of availability in the estimation of national populations;Brown;Memory & Cognition,1992
3. Darwin's missing link: A new paradigm for evolution education;Catley;Science Education,2006
4. Catley, K., Lehrer, R., & Reiser, B. (2005). Tracing a prospective learning progression for developing understanding of evolution. Paper Commissioned by the National Academies Committee on Test Design for K-12 Science Achievement. http://www7.nationalacademies.org/bota/Evolution.pdf.