↑ Field, Richard. "John Dewey (1859—1952)". The Internet Encyclopedia of Philosophy (IEP). Retrieved 23 January 2013.
↑ Saatkamp, Herman. "George Santayana". The Stanford Encyclopedia of Philosophy (SEP). Retrieved 23 January 2013.
↑ Caleb Flamm, Matthew. "George Santayana (1863—1952)". The Internet Encyclopedia of Philosophy (IEP). Retrieved 23 January 2013.
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