Orapan Nabangchang. (2009). Private contributions towards the provision of public goods: The conservation of Thailand's endangered species. Economy and Environment Program for Southeast Asia.
Chicago-referens (17:e uppl.)Orapan Nabangchang. Private Contributions Towards the Provision of Public Goods: The Conservation of Thailand's Endangered Species. Singapore: Economy and Environment Program for Southeast Asia, 2009.
MLA-referens (9:e uppl.)Orapan Nabangchang. Private Contributions Towards the Provision of Public Goods: The Conservation of Thailand's Endangered Species. Economy and Environment Program for Southeast Asia, 2009.
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