Não informado. (1972). Improving human performance quarterly. National Society for Programmed Instruction.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Improving Human Performance Quarterly. Washington: National Society for Programmed Instruction, 1972.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Improving Human Performance Quarterly. National Society for Programmed Instruction, 1972.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.