Tunstall, D. B., & Wansem, M. v. d. (1992). 1993 directory of country environmental studies: An annotated bibliography environmental and natural resource profiles and assesments. World Resources Institute.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিTunstall, Daniel B., এবং Mieke van der Wansem. 1993 Directory of Country Environmental Studies: An Annotated Bibliography Environmental and Natural Resource Profiles and Assesments. Nueva York: World Resources Institute, 1992.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিTunstall, Daniel B., এবং Mieke van der Wansem. 1993 Directory of Country Environmental Studies: An Annotated Bibliography Environmental and Natural Resource Profiles and Assesments. World Resources Institute, 1992.
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