Schelling, F. W. J. v., & Wirth, J. M. (2000). The ages of the world. State University of New York Press.
Dyfyniad Arddull ChicagoSchelling, Friedrich Wilhelm Joseph von, and Jason M. Wirth. The Ages of the World. Albany: State University of New York Press, 2000.
Dyfyniad MLASchelling, Friedrich Wilhelm Joseph von, and Jason M. Wirth. The Ages of the World. State University of New York Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.