1. 1) Yuichiro Hirano and Rui Izumi, 2012. Development and Problems of Recent Footpath Projects in Japan. Bulletin of Senshu University School of Human Sciences: Sociology, Vol.2, No.2, pp.127-140 (In Japanese)
2. 2) Iwao Ogawa, 2012. Growing Footpaths in Hokkaido - For Further Development. Kaihatsu Koho, No.582, pp.39-43 (In Japanese)
3. 3) Footpath Network Hokkaido, http://footpath-network-hokkaido.azurewebsites.net/ referred on 4/3/2017
4. 4) Hiroshi Hiramatsu, 1995. An Introductory Study of The Environmental Law in England – Historical Change of Commons and Development of Open Spaces, Keibundo (In Japanese)
5. 5) Angela Sydenham, 2007. Public Rights of Way and Access to Land, Third Edition, Jordan Publishing Limited