Kessler, C. (1993). International Scientific Cooperation, Consolidated report of activities, 1987 - 90. s.n.
Style de citation Chicago (17e éd.)Kessler, C. International Scientific Cooperation, Consolidated Report of Activities, 1987 - 90. s.l: s.n, 1993.
Style de citation MLA (9e éd.)Kessler, C. International Scientific Cooperation, Consolidated Report of Activities, 1987 - 90. s.n, 1993.
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