Olofson, H. (1981). Adaptive strategies and change in Philippine swidden-based societies. Forest Research Institute.
Chicago-referens (17:e uppl.)Olofson, Harold. Adaptive Strategies and Change in Philippine Swidden-based Societies. College, Laguna: Forest Research Institute, 1981.
MLA-referens (9:e uppl.)Olofson, Harold. Adaptive Strategies and Change in Philippine Swidden-based Societies. Forest Research Institute, 1981.
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