« In the Qingyang region especially, the ratio of cave dwellers to non-cave dwellers is the highest found anywhere in China. », (en) Gideon Golany, Chinese earth-sheltered dwellings : Indigenous Lessons for Modern Urban Design, Honolulu, University of Hawaii Press, , 178 p. (ISBN978-0-8248-1369-7, LCCN91021496, lire en ligne), p. 44 (aperçu limité en ligne)
« In the Qingyang region especially, the ratio of cave dwellers to non-cave dwellers is the highest found anywhere in China. », (en) Gideon Golany, Chinese earth-sheltered dwellings : Indigenous Lessons for Modern Urban Design, Honolulu, University of Hawaii Press, , 178 p. (ISBN978-0-8248-1369-7, LCCN91021496, lire en ligne), p. 44 (aperçu limité en ligne)
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lccn.loc.gov
« In the Qingyang region especially, the ratio of cave dwellers to non-cave dwellers is the highest found anywhere in China. », (en) Gideon Golany, Chinese earth-sheltered dwellings : Indigenous Lessons for Modern Urban Design, Honolulu, University of Hawaii Press, , 178 p. (ISBN978-0-8248-1369-7, LCCN91021496, lire en ligne), p. 44 (aperçu limité en ligne)