http://hayabusa.open2ch.net/test/read.cgi/news4vip/1402055495/

https://ja.wikipedia.org/wiki/%E7%86%9F%E8%AA%9E_(%E6%BC%A2%E5%AD%97)

http://okjiten.jp/

http://www.lance2.net/gogen/a-a.html

http://www.toolfirst.jp/chishiki/hagashi.htm

https://ja.wikipedia.org/wiki/%E3%83%92%E3%83%88%E7%A7%91

http://gigazine.net/news/20160329-flagstories/

http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1145514581

http://blog.livedoor.jp/nwknews/archives/5027556.html

http://kotowazashuu.web.fc2.com/

https://ja.wikipedia.org/wiki/%E5%A4%A7%E9%87%8F%E7%B5%B6%E6%BB%85

http://blog.livedoor.jp/drazuli/archives/6820005.html

https://ja.wikiquote.org/wiki/Wikiquote:%E4%BA%BA%E5%90%8D%E7%B4%A2%E5%BC%95_%E4%BA%94%E5%8D%81%E9%9F%B3%E9%A0%86

http://toshokan.in/

http://www.nao.ac.jp/astro/sky/