Zirkle, Conway. "7. Evolution Theory in the Twentieth Century".
Evolution, Marxian Biology, and the Social Scene, Philadelphia: University of Pennsylvania Press, 1959, pp. 217-248.
https://doi.org/10.9783/9781512809046-008Zirkle, C. (1959). 7. Evolution Theory in the Twentieth Century. In
Evolution, Marxian Biology, and the Social Scene (pp. 217-248). Philadelphia: University of Pennsylvania Press.
https://doi.org/10.9783/9781512809046-008Zirkle, C. 1959. 7. Evolution Theory in the Twentieth Century.
Evolution, Marxian Biology, and the Social Scene. Philadelphia: University of Pennsylvania Press, pp. 217-248.
https://doi.org/10.9783/9781512809046-008Zirkle, Conway. "7. Evolution Theory in the Twentieth Century" In
Evolution, Marxian Biology, and the Social Scene, 217-248. Philadelphia: University of Pennsylvania Press, 1959.
https://doi.org/10.9783/9781512809046-008Zirkle C. 7. Evolution Theory in the Twentieth Century. In:
Evolution, Marxian Biology, and the Social Scene. Philadelphia: University of Pennsylvania Press; 1959. p.217-248.
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