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 Society for Effecting the Abolition of the Slave Trade:

"

The committee was later joined by the Quaker philanthropist William Allen, who worked closely with Wilberforce and with his fellow Quaker members,[citation needed] and Wilberforce's fellow members of the Clapham Sect were subscribers to the society as well.[1] Director of the Bank of England and founding member of the Philanthropic Society in St. George's Fields[2] Jeremiah Harman was also a promenade supporter[3] and subscriber[3] of the initial publication of the Society.[3]