[1] 沈徳符 - Wikipedia, 2023-04-29T14:19:17.000Z, 2023-05-13T14:19:23.551Z https://ja.wikipedia.org/wiki/%E6%B2%88%E5%BE%B3%E7%AC%A6

[2] 历代正闰考_百度百科 (2023-05-13T14:20:41.000Z) https://baike.baidu.com/item/%E5%8E%86%E4%BB%A3%E6%AD%A3%E9%97%B0%E8%80%83/8450509?fr=aladdin

[3] Li dai zheng run kao : si juan | Library of Congress (2023-05-13T14:21:04.000Z) https://www.loc.gov/item/2014514145

[4] Li dai zheng run kao : si juan - Juan 1 | Library of Congress (2023-05-13T14:33:36.000Z) https://www.loc.gov/resource/lcnclscd.2014514145.1A001/?st=slideshow