On the role of motivation in self-directed learning. The "two-shells-model of motivated self-directed learning" as a structural explanatory concept

• Localización: European journal of psychology of education, ISSN-e 1878-5174, ISSN 0256-2928, Vol. 14, Nº 1, 1999, págs. 71-88
• Idioma: inglés
• DOI: 10.1007/bf03173112
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