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 Eileen Power:

"

In 1937, Power married her pupil and colleague, the historian Michael Postan, Professor of Economic History at the University of Cambridge, having previously been engaged to Reginald Johnston, tutor to the last Emperor of China, Puyi. She died of heart failure in 1940.[citation needed]