O'Neil, H. F. (1979). Procedures for instructional systems development. Academic Press.
Chicago Style (17th ed.) ZitazioaO'Neil, Harold F. Procedures for Instructional Systems Development. Nueva York: Academic Press, 1979.
MLA (9th ed.) ZitazioaO'Neil, Harold F. Procedures for Instructional Systems Development. Academic Press, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.