Perry, W. J. (1987). Technologies to maintain biological diversity. Washington: Congress of the United States.
Trích dẫn kiểu ChicagoPerry, William J. Technologies to Maintain Biological Diversity. Washington: Congress of the United States, 1987.
Deismireacht MLAPerry, William J. Technologies to Maintain Biological Diversity. Washington: Congress of the United States, 1987.
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