Hughes, J. L. (1962). Programed instruction for schools and industry. Science Research Associates.
Chicago-Zitierstil (17. Ausg.)Hughes, John Leo. Programed Instruction for Schools and Industry. Chicago: Science Research Associates, 1962.
MLA-Zitierstil (9. Ausg.)Hughes, John Leo. Programed Instruction for Schools and Industry. Science Research Associates, 1962.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.