Williams, J. D. (1967). Designing a responsive environment: Some devices for self-instruction in number.
Lua i Stíl Chicago (17ú heag.)Williams, John D. Designing a Responsive Environment: Some Devices for Self-instruction in Number. 1967.
Lua MLA (9ú heag.)Williams, John D. Designing a Responsive Environment: Some Devices for Self-instruction in Number. 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
