Briggs, L. J. (1968). Sequencing of instruction in relation to hierarchies of competence. A final report prepared by the Instructional Methods Program of the Center for Research and Evaluation in Applications of Technology in Education (CREATE). Submitted to U.S. Dept. of Health, Education, and Welfare, Office of Education. American Institute for Research.

Briggs, Leslie J. Sequencing of Instruction in Relation to Hierarchies of Competence. A Final Report Prepared by the Instructional Methods Program of the Center for Research and Evaluation in Applications of Technology in Education (CREATE). Submitted to U.S. Dept. of Health, Education, and Welfare, Office of Education. [Pittsburgh]: American Institute for Research, 1968.

Briggs, Leslie J. Sequencing of Instruction in Relation to Hierarchies of Competence. A Final Report Prepared by the Instructional Methods Program of the Center for Research and Evaluation in Applications of Technology in Education (CREATE). Submitted to U.S. Dept. of Health, Education, and Welfare, Office of Education. American Institute for Research, 1968.