The following is probably the closest match to what is on the web, but it is not identical to it.

Anderson, J. R., Reder, L. M. & Simon, H. A. (1998). Radical Constructivism and Cognitive Psychology. In Ravitch, D. (Ed). Brookings Papers on Education Policy: 1998. Washington, D.C. Brookings Institution, pp. 227-255.

We have also published another paper:

Anderson, J. R., Reder, L. M. & Simon, H. A. (1996) Situated Learning and Education. Educational Researcher, 25 (4) pp. 5-11.

and a response to a response to this article:

Anderson, J. R., Reder, L. M. & Simon, H. A. (1997) Situated versus Cognitive Perspectives: Form versus Substance. Educational Researcher, 26 (1), 18-21.