Snelbecker, G. E. 1. (1974). Learning theory, instructional theory, and psychoeducational design. McGraw-Hill Book Company.
Lua i Stíl Chicago (17ú heag.)Snelbecker, Glenn E. 1931. Learning Theory, Instructional Theory, and Psychoeducational Design. New York: McGraw-Hill Book Company, 1974.
Lua MLA (9ú heag.)Snelbecker, Glenn E. 1931. Learning Theory, Instructional Theory, and Psychoeducational Design. McGraw-Hill Book Company, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.