Southwest Regional Laboratory for Educational Research and Development, Baker, R. L., & Schutz, R. E. (1971). Instructional product development. Van Nostrand Reinhold Co..
Lua i Stíl Chicago (17ú heag.)Southwest Regional Laboratory for Educational Research and Development, Robert Lee Baker, agus Richard E. Schutz. Instructional Product Development. New York: Van Nostrand Reinhold Co., 1971.
Lua MLA (8ú heag.)Southwest Regional Laboratory for Educational Research and Development, et al. Instructional Product Development. Van Nostrand Reinhold Co., 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.