Callender, P. (1969). Programmed learning: Its development and structure. Longmans.
Čikaški stil citiranja (17. izdanje)Callender, Patricia. Programmed Learning: Its Development and Structure. Harlow: Longmans, 1969.
MLA način citiranja (8. izdanje)Callender, Patricia. Programmed Learning: Its Development and Structure. Longmans, 1969.
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