Hirsch, Philip, Warren, Carol, ed. The Politics of Environment in Southeast Asia: resources and resistance. Taylor and Francis. 242-244. or. ISBN 9780203030172.[2]
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books.google.pt
Wheeler, Tony (1992). South-East Asia: On a Shoestring (Lonely Planet on a Shoestring) (7. ed.). Lonely Planet. 267-268.or.[1]