Here some references for concept mapping:

Roth, W.-M., & Roychoudhury, A. (1994). Science discourse through collaborative concept mapping: New perspectives for the teacher. International Journal of Science Education, 16, 437-455.

Roth, W.M. (1994). Student views of collaborative concept mapping: An emancipatory research project. Science Education, 78, 1-34.

Roth, W.-M., & Roychoudhury, A. (1993). The concept map as a tool for the collaborative construction of knowledge: A microanalysis of high school physics students. Journal of Research in Science Teaching, 30, 503-534.

Roth, W.-M., & Roychoudhury, A. (1992). The social construction of scientific concepts or The concept map as conscription device and tool for social thinking in high school science. Science Education, 76, 531-557.

Many of the following references have the problem that they do not recognize the important role that community and language play in knowing and learning.

Heinze-Fry, J. A., & Novak, J. D. (1990). Concept mapping brings long-term movement toward meaningful learning. Science Education, 74, 461-472.

Horton, P. B., McConney, A. A., Gallo, M., Woods, A. L., Senn, G. J., & Hamelin, D. (1993). An investigation of the effectiveness of concept mapping as an instructional tool. Science Education, 77, 95-111.

Jegede, O. J., Alaiyemola, F. F., & Okebukola, P. A. (1990). The effect of concept mapping on students' anxiety and achievement in biology. Journal of Research in Science Teaching, 27, 951-960.

Lehman, J. D., Carter, C., & Butler, J. K. (1985). Concept mapping, vee mapping, and achievement: Results of a field study with black high school students. Journal of Research in Science Teaching, 22, 663-673.

Novak, J. D. (1990). Concept mapping: A useful tool for science education. Journal of Research in Science Teaching, 27, 937-949.

Novak, J. D., & Gowin, D. B. (1984). Learning how to learn. Cambridge: Cambridge University Press.

Novak, J. D., Gowin, D. B., & Johansen, G. T. (1983). The use of concept mapping and knowledge Vee mapping with junior high school science students. Science Education, 67, 625-645.

Okebukola, P. A. (1990). Attaining meaningful learning of concepts in genetics and ecology: An examination of the potency of the concept mapping technique. Journal of Research in Science Teaching, 27, 493-504.

Okebukola, P. A., & Jegede, O. J. (1988). Cognitive preference and learning mode as determinants of meaningful learning through concept mapping. Science Education, 72, 489-500.

Pankratius, W. J. (1990). Building an organized knowledge base: Concept mapping and achievement in secondary school physics. Journal of Research in Science Teaching, 27, 315-333.