Manahan, G. V. (1998). Ecology, humans and the geography of the environment (second of two parts). Philippine Architects' Journal.
Chicago-viite (17. p.)Manahan, Geronimo V. "Ecology, Humans and the Geography of the Environment (second of Two Parts)." Philippine Architects' Journal 1998.
MLA-viite (9. p.)Manahan, Geronimo V. "Ecology, Humans and the Geography of the Environment (second of Two Parts)." Philippine Architects' Journal, 1998.
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