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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.