Eichhoefer, G. W. (1995). Enduring issues in philosophy: Opposing viewpoints. Greenhaven Press.
Lua i Stíl Chicago (17ú heag.)Eichhoefer, Gerald W. Enduring Issues in Philosophy: Opposing Viewpoints. San Diego, CA: Greenhaven Press, 1995.
Lua MLA (8ú heag.)Eichhoefer, Gerald W. Enduring Issues in Philosophy: Opposing Viewpoints. Greenhaven Press, 1995.
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