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.
Citazione stile Chigago Style (17a edizione)Tunstall, Daniel B., e 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.
Citatione MLA (9a ed.)Tunstall, Daniel B., e 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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