Baumert, J. / 1998 / Prepared for life-long learning: Frame of reference for the measurement of self-regulated learning as a cross-curricular competency in the PISA Project / OECD Candy, P. / 1991 / Self-direction for lifelong learning: A comprehensive guide to theory and practice / Jossy-Bass Guglielmino, L. M. / 1997 / Development of the self-directed learning readiness scale / 박사 / University of Georgia Knowles, M. / 1975 / Self-direction learning: A guide for learners and teacher / Association Press Long, H. B. / 1992 / Philosophical, psychological and practical justification or studying self-direction in learning, In Self-directed learning application and research / Research Cente