1. Parcel Shipping Index Reports Global Parcel Shipping Reaches $279 Billion in Revenue. Business Wire 2018https://www.businesswire.com/news/home/20180828005237/en/
2. http://www.chinadaily.com.cn/a/201801/13/WS5a59ef62a3102c394518f090.html
3. For Couriers, China’s E-Commerce Boom Can Be a Tough Road;Mcmorrow,2018
4. National Social E-commerce Logistics Practitioner Research Reporthttp://www.aliresearch.com/blog/article/detail/id/20922.html
5. Couriers Being Driven to Despair;Hou,2017