1. Allen, W. H. Audio-visual communication. In C. W. Harris (Ed.),Encyclopedia of educational research. (3rd ed.) New York: Macmillan, 1960. Pp. 123–130.
2. Allen, W. H. Categories of instructional media research. In G. Salomon and R. E. Snow (Eds.), Commentaries on research in instructional media: An examination of conceptual schemes.Viewpoints: Bulletin of the School of Education, Indiana University, 1970,46, 1–13. (a)
3. Allen, W. H. Trends in instructional technology-the ERIC at Stanford1970 planning report. Stanford, Cal.: Stanford University, ERIC Clearinghouse on Educational Media and Technology, 1970. (b)
4. Briggs, L. J.Sequencing of instruction in relation to hierarchies of competence. Pittsburgh, Pa.: American Institutes for Research, 1968.
5. Briggs, L. J.Handbook of procedures for the design of instruction. Pittsburgh, Pa.: American Institutes for Research, September 1970.