Wales, C. E., & Stager, R. A. (1978). The guided design approach. Educational Technology Publications.
Lua i Stíl Chicago (17ú heag.)Wales, Charles E., agus Robert A. Stager. The Guided Design Approach. Englewood Cliffs, N.J.: Educational Technology Publications, 1978.
Lua MLA (8ú heag.)Wales, Charles E., agus Robert A. Stager. The Guided Design Approach. Educational Technology Publications, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.