Turchin, P., & Nefedov, S. A. (2009). Secular cycles. Princeton University Press.
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Dyfyniad Arddull Chicago
Turchin, Peter, and S. A. Nefedov. Secular Cycles. Princeton, N.J.: Princeton University Press, 2009.
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Dyfyniad MLA
Turchin, Peter, and S. A. Nefedov. Secular Cycles. Princeton University Press, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.