1. & (1979). Cognitive Processes. Englewood Cliffs, NJ: Prentice-Hall.
2. (1987). Problem-solving protocols in organic synthesis. Unpublished raw data.
3. (1988). A qualitative analysis of graduate student problem solving in organic synthesis. Unpublished master's thesis, Purdue University, West Lafayette, IN.
4. (1987). The role of beliefs in general chemistry problem solving. Unpublished doctoral dissertation, Purdue University, West Lafayette, IN.
5. & (1981). Categorization and representation of physics problems by experts and novices. Technical Report No. 4, Learning Research and Development Center, University of Pittsburgh.