Preston, D. A. (1978). Rural migration to the Ecuadorian Oriente. School of Geography, University of Leeds.
Chicago-referens (17:e uppl.)Preston, David A. Rural Migration to the Ecuadorian Oriente. Leeds: School of Geography, University of Leeds, 1978.
MLA-referens (8:e uppl.)Preston, David A. Rural Migration to the Ecuadorian Oriente. School of Geography, University of Leeds, 1978.
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