Callender, P. (1969). Programmed Learning: Its development and structure. Longmans.
Citazione stile Chigago Style (17a edizione)Callender, Patricia. Programmed Learning: Its Development and Structure. London: Longmans, 1969.
Citatione MLA (9a ed.)Callender, Patricia. Programmed Learning: Its Development and Structure. Longmans, 1969.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.