Study abroad levels: Toward a classification of program types
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Engle, L., Engle, J. 2003. Study abroad levels: Toward a classification of program types. Frontiers: The interdisciplinary journal of study abroad, 9, 1-20.
Engle, L. (2013). The Rewards of Qualitative Assessment Appropriate to Study Abroad. Frontiers: The interdisciplinary journal of study abroad, 22, 111-126