• Japan Heat Supply Business Association (JHSBA)　http://www.jdhc.or.jp/
• Japan District Heating & Cooling Association (JDHCA)　http://www.dhcjp.or.jp/
• Official website of Yokohama Minato Mirai 21　http://www.minatomirai21.com/
• City of Yokohama　http://www.city.yokohama.jp/
• Minato Mirai Honcho (Yokohama municipal) Primary School HP　https://www.edu.city.yokohama.lg.jp/school/es/minatomiraihoncho/