Curtis, G. T. (1887). Creation or evolution?: A philosophical inquiry. D. Appleton and Company.
Chicago-viite (17. p.)Curtis, George Ticknor. Creation or Evolution?: A Philosophical Inquiry. New York: D. Appleton and Company, 1887.
MLA-viite (8. p.)Curtis, George Ticknor. Creation or Evolution?: A Philosophical Inquiry. D. Appleton and Company, 1887.
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