Worldwatch Institute, Brown, L. R., & Starke, L. (1988). State of the world 1988: A Worldwatch Institute report on progress toward a sustainable society. Norton.
Chicago-viite (17. p.)Worldwatch Institute, Lester R. Brown, ja Linda Starke. State of the World 1988: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York : London: Norton, 1988.
MLA-viite (8. p.)Worldwatch Institute, et al. State of the World 1988: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton, 1988.
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