Caldwell, L. K. (1972). In defense of earth: International protection of the biosphere. Indiana University Press.
Tohutoru Kātū Chicago (17th ed.)Caldwell, Lynton K. In Defense of Earth: International Protection of the Biosphere. London: Indiana University Press, 1972.
Tohutoro MLA (9th ed.)Caldwell, Lynton K. In Defense of Earth: International Protection of the Biosphere. Indiana University Press, 1972.
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