ebrary, Inc, & De Groot, J. (2004). Nature in American philosophy. Catholic University of America Press.
Čikaški stil citiranja (17. izdanje)ebrary, Inc, i Jean De Groot. Nature in American Philosophy. Washington, D.C.: Catholic University of America Press, 2004.
MLA način citiranja (9. izdanje)ebrary, Inc, i Jean De Groot. Nature in American Philosophy. Catholic University of America Press, 2004.
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