I don't know about canonical, but back when I was dealing with fuzziness I found this book to be very good: https://eresources.nlb.gov.sg/printheritage/detail/f41c8610-...

But, it's probably a bit out of date by now.

Also, if you'd like to learn more about Type-2 Fuzzy Systems, look up anything by Hani Hagras (disclaimer: colleague of mine from the same university, but highly regarded in this field)