[Urbana] : Center for Instructional Research and Curriculum Evaluation, University of Illinois at Urbana-Champaign ; Washington : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1978.
Weiss, Iris R.
Research Triangle Park, N.C. : Center for Educational Research and Evaluation ; Washington : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1978.