(1965). Programmed learning in perspective ; a guide to program writing.
Chicago-čujuhus (17. p.)Programmed Learning in Perspective ; a Guide to Program Writing. 1965.
MLA-čujuhus (9. p.)Programmed Learning in Perspective ; a Guide to Program Writing. 1965.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.