[1] [CITE@ja[天界 (雑誌) - Wikipedia]]
([TIME[2015-12-14 23:27:28 +09:00]] 版)
<https://ja.wikipedia.org/wiki/%E5%A4%A9%E7%95%8C_(%E9%9B%91%E8%AA%8C)>

[2] [CITE[天界(東亜天文学会・機関誌)]]
([TIME[2016-01-14 23:28:29 +09:00]] 版)
<https://web.archive.org/web/20061013164429/http://www.amy.hi-ho.ne.jp/oaa-web/tuuhan/tenkai.htm>

[3] [CITE[「天界」旧号 目次]]
([TIME[2002-06-08 14:29:11 +09:00]] 版)
<http://www.h5.dion.ne.jp/~iruka-fu/D010/Tenkai.htm>

[4] [CITE[Kyoto University Research Information Repository: 天界]] ([TIME[2016-02-27 17:12:08 +09:00]] 版) <http://repository.kulib.kyoto-u.ac.jp/dspace/handle/2433/159113>