Não informado. (1972). Improving human performance quarterly. National Society for Programmed Instruction.
Chicago-referens (17:e uppl.)Não informado. Improving Human Performance Quarterly. Washington: National Society for Programmed Instruction, 1972.
MLA-referens (8:e uppl.)Não informado. Improving Human Performance Quarterly. National Society for Programmed Instruction, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.