Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Xiang Jingyu:

"

In 1919, Xiang joined the New Citizen Study Society, which had been founded by Mao Zedong and Cai Hesen.[3]: 79  So Xiang Jingyu went to Beijing, and paid a visit to Mr. Cai Yuanpei, the principle of Peking University. In Beijing, Xiang Jingyu met with Cai Hesen and had a good relationship with him.[citation needed]