Esbensen, T. (1968). Working with individualized instruction: The Duluth experience. Fearon Publishers.
Lua i Stíl Chicago (17ú heag.)Esbensen, Thorwald. Working with Individualized Instruction: The Duluth Experience. Palo Alto, Calif.: Fearon Publishers, 1968.
Lua MLA (8ú heag.)Esbensen, Thorwald. Working with Individualized Instruction: The Duluth Experience. Fearon Publishers, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.