Zaitchik, J. A., & Wiehe, R. E. (1993). Human values: Perspectives on six themes. Brown & Benchmark.
Lua i Stíl Chicago (17ú heag.)Zaitchik, Joseph A., agus Roger E. Wiehe. Human Values: Perspectives on Six Themes. Madison, Wis.: Brown & Benchmark, 1993.
Lua MLA (8ú heag.)Zaitchik, Joseph A., agus Roger E. Wiehe. Human Values: Perspectives on Six Themes. Brown & Benchmark, 1993.
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