Lange, D. L. (1972). Individualization of instruction. National Texbook Comp.
Lua i Stíl Chicago (17ú heag.)Lange, Dale L. Individualization of Instruction. National Texbook Comp, 1972.
Lua MLA (8ú heag.)Lange, Dale L. Individualization of Instruction. National Texbook Comp, 1972.
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