organised jointly by the Centre for Educational Research and Innovation at OECD, Paris, and the University of Illinois, and sponsored by the National Science Foundation; a report by Stuart MaclureOrganisation for Economic Co-operation and Development1972
the Institute of Curriculum Experimentation of the Center for Continuation Study, University of Minnesota ; edited by Paul C. Rosenbloom with the assistance of Paul C. HillestadMcGraw-Hill1964