International Peat Congress & International Peat Society. (1981). Proceedings of the 6th International Peat Congress: Duluth Arena-Auditorium, Duluth, Minnesota, USA August 17-23, 1980 : the role of peatlands in a world of limited resources--energy, food, fiber and natural areas. s.n..
Chicago Style (17th ed.) CitationInternational Peat Congress and International Peat Society. Proceedings of the 6th International Peat Congress: Duluth Arena-Auditorium, Duluth, Minnesota, USA August 17-23, 1980 : The Role of Peatlands in a World of Limited Resources--energy, Food, Fiber and Natural Areas. [S.l.: s.n., 1981.
MLA (8th ed.) CitationInternational Peat Congress and International Peat Society. Proceedings of the 6th International Peat Congress: Duluth Arena-Auditorium, Duluth, Minnesota, USA August 17-23, 1980 : The Role of Peatlands in a World of Limited Resources--energy, Food, Fiber and Natural Areas. s.n., 1981.