Morris, H. M. (1963). The twilight of evolution. Baker Book House.
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Dyfyniad Arddull Chicago
Morris, Henry Madison. The Twilight of Evolution. Grand Rapids: Baker Book House, 1963.
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Dyfyniad MLA
Morris, Henry Madison. The Twilight of Evolution. Baker Book House, 1963.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.