Goldin, Paul R. (2010) "Steppe Nomads as a Philosophical Problem in Classical China" in Mapping Mongolia: Situating Mongolia in the World from Geologic Time to the Present. Penn Museum International Research Conferences, vol. 2. Ed. Paula L.W. Sabloff. Philadelphia: University of Pennsylvania. 2011. p. 225-226
Sima Zhen. Suoyin, chapter 24, quote: "又樂彥括地譜云夏桀無道湯放之鳴條三年而死其子獯粥妻桀之衆妾避居北野隨畜移徙中國謂之匈奴". Note: In ms. 產 Chăn is written as 彥 Yàn, which is abbreviated to 产 and serves as 產's phonetic component.
