guidelines - Resources for learning Gestalt principles

I've seen the Gestalt principles or laws referenced often when it comes to graphic design and even UI and UX.

Is there some definitive guide, book or original research about this subject that I can read more about?

I'm highly fascinated by the subject and mostly interested in who started researching about the Gestalt principles. I've tried to find the original research source while I was a student at the university but had no luck (considering it dates back to 1920's).