1. Acton, W. H. (1991). Comparison of criterion referenced and criterion free measures of cognitive structure. Unpublished doctoral dissertation, University of New Mexico, Albuquerque.
2. Acton, W. H., Johnson, P. J., & Goldsmith, T. E. (1994). Structural knowledge assessment: Comparison of referent structures. Journal of Educational Psychology, 86(2), 303–311.
3. Asan, A. (2007). Concept mapping in science class: A case study of fifth grade students. Educational Technology and Society, 10(1), 186–195.
4. Ausubel, D. P. (1968). Educational psychology: A cognitive view. New York: Holt, Rinehart and Winston.
5. Azzarello, J. (2007). Use of the pathfinder scaling algorithm to measure students’ structural knowledge of community health nursing. Journal of Nursing Education, 46(7), 313–318.