*"[https://kotobank.jp/word/%E6%9C%B1%E7%B4%88-77562 Shu Gan]," ''Britannica kokusai dai hyakka jiten'', Britannica Japan, 2014. | *"[https://kotobank.jp/word/%E6%9C%B1%E7%B4%88-77562 Shu Gan]," ''Britannica kokusai dai hyakka jiten'', Britannica Japan, 2014. |