1. Barrza, L. (1996) Environmental Knowledge and Attitudes of English and Mexican School Children, PhD dissertation, University of Cambridge
2. Stereotypic images of the scientist: the draw-a-scientist test;Chambers;Science Education,1983
3. An introduction to understanding children;Griever,1990
4. Di Leo: Interpreting children's drawings;Joseph,1983
5. Analysing Children's Art;Kellogg,1970