Mager, R. F., & Beach, K. M. (1967). Developing vocational instruction. Fearon Publishers.
Lua i Stíl Chicago (17ú heag.)Mager, Robert Frank, agus Kenneth M. Beach. Developing Vocational Instruction. Palo Alto, Calif.: Fearon Publishers, 1967.
Lua MLA (8ú heag.)Mager, Robert Frank, agus Kenneth M. Beach. Developing Vocational Instruction. Fearon Publishers, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.