1. Ministry of Justice of Japan Vital statistics in Japan 2014 http://www.e-stat.go.jp/SG1/estat/List.do?lid=000001127507
2. People's Daily Online The details of Chinese people in Japan 2012 http://j.people.com.cn/94475/7741266.html
3. Chinese Zuoyuezi (Sitting in for the first month of the postnatal period) in Scotland;Cheung;Midwifery,1997
4. The support to the foreign women in particular Chinese women in during childbirth in the hospital: A Chinese custom;Nakayama;Japanese Journal of Maternal Health,1996