1. 〈https://www.huxiu.com/article/373055.html〉.
2. 〈http://www.ndtv.com/india-news/return-old-cellphone-get-a-reward-you-may-be-entitled-to-this-soon-1290067?pfrom=home-lateststories〉.
3. 〈h〉〈ttp://auto.people.com.cn/n/2015/0812/c1005–27448543.html〉.
4. 〈https://www.fedsmallbusiness.org/〉.
5. 〈http://www.ca-sme.org/content/Content/index/id/28659〉.