Hughes, J. L. (1962). Programed instruction for schools and industry. Science Research Associates.
Chicago-čujuhus (17. p.)Hughes, John Leo. Programed Instruction for Schools and Industry. Chicago: Science Research Associates, 1962.
MLA-čujuhus (9. p.)Hughes, John Leo. Programed Instruction for Schools and Industry. Science Research Associates, 1962.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.