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 Jonsson Engineering Center:

"

A unique ground breaking ceremony took place on April 18, 1975. An underground explosion on the nearby '86 field was triggered by a long distance phone call placed by Margaret Jonsson, J. Erik Jonsson's wife, from Dallas, Texas. [1]