Schelling, F. W. J. v., & Wirth, J. M. (2000). The ages of the world. State University of New York Press.
Lua i Stíl Chicago (17ú heag.)Schelling, Friedrich Wilhelm Joseph von, agus Jason M. Wirth. The Ages of the World. Albany: State University of New York Press, 2000.
Lua MLA (9ú heag.)Schelling, Friedrich Wilhelm Joseph von, agus Jason M. Wirth. The Ages of the World. State University of New York Press, 2000.
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