https://www.yearbookchina.com/navisearch-2-0-0-1-china-0.html；中国统计年鉴
https://www.yearbookchina.com/navisearch-2-0-3-1-beijing-0.html；北京市统计年鉴
https://www.yearbookchina.com/navisearch-2-0-3-1-tianjin-0.html；天津市统计年鉴
https://www.yearbookchina.com/navisearch-2-0-3-1-beijing-0.html；北京市统计年鉴
https://www.yearbookchina.com/navisearch-2-0-3-1-tianjin-0.html；天津市统计年鉴
