http://www.asahi.com/articles/ASGD54FDDGD5TIPE00X.html

http://tabi-labo.com/47508/naturemilkyway/

http://dw.diamond.ne.jp/articles/-/11877

昨年の１５０人申込から大幅減少 http://www.jinji.go.jp/kisya/1409/houmumoushi26.pdf http://kuronekonotsubuyaki.blog.fc2.com/blog-entry-872.html

http://www3.nhk.or.jp/news/html/20141215/t10013992461000.html