1. and , Cumulative Index for Science Education, Volumes 1–60, 1916–1976. Pittsburgh, Perm.: Learning Research and Development Center, University of Pittsburgh, 1977.
2. “Creative thinking, problem solving, and instruction,” in Theories of Learning and Instruction, Sixty- Third Yearbook of the National Society for the Study of Education, Part I, Chmn., Chicago: Univ. of Chicago Press, 1964, pp. 240–267.