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 Constantijn Huygens:

"

In 1616, Maurits and Constantijn started studies at Leiden University.[1] Studying in Leiden was primarily seen as a way to build a social network. Shortly after, Maurits was called home to assist his father. Constantijn finished his studies in 1617 and returned home.[1] This was followed by six weeks of training with Antonis de Hubert, a lawyer in Zierikzee. De Hubert was committed to the study of language and writing, having held consultations with Pieter Corneliszoon Hooft, Laurens Reael and Joost van den Vondel concerning language and orthography in 1623.[citation needed]