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 Rúhíyyih Khánum:

"

Whilst in Germany, Mary received an invitation from Shoghi Effendi to go on pilgrimage with her mother. Both mother and daughter accepted the invitation. They were initially planning to travel through the Balkans and visit the Baháʼís, but the unrest of the area forced them to travel directly to Haifa.[3]