"Population News of Major Cities". Statistical Information Division, Policy Bureau, City of Yokohama. September 1, 2015. Archived from the original on January 13, 2016. Retrieved November 10, 2017.
"Population News of Major Cities". Statistical Information Division, Policy Bureau, City of Yokohama. September 1, 2015. Archived from the original on January 13, 2016. Retrieved November 10, 2017.