International Development Research Centre & Foster, T. C. (1993). A Guide to agenda 21: Issues, debates and Canadian initiatives. International Development Research Center.
Chicago-viite (17. p.)International Development Research Centre ja Theodora Carroll Foster. A Guide to Agenda 21: Issues, Debates and Canadian Initiatives. Ottawa, Ontario: International Development Research Center, 1993.
MLA-viite (9. p.)International Development Research Centre ja Theodora Carroll Foster. A Guide to Agenda 21: Issues, Debates and Canadian Initiatives. International Development Research Center, 1993.
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