Callender, P. (1969). Programmed Learning: Its development and structure. Longmans.
Citace podle Chicago (17th ed.)Callender, Patricia. Programmed Learning: Its Development and Structure. London: Longmans, 1969.
Citace podle MLA (9th ed.)Callender, Patricia. Programmed Learning: Its Development and Structure. Longmans, 1969.
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