There have been several publications over the last decade and at least a couple last year!
Below a list from some well established authorities on the subject.
In chronological order:
Stevenson, Tom, and Essi Avellan. Christie's World Encyclopedia of Champagne & Sparkling Wine. Absolute Press, 2014.
Liem, Peter. Champagne: The Essential Guide to the Wines, Producers, and Terroirs of the Iconic Region. Clarkson Potter/Ten Speed Press, 2017.
Stelzer, Tyson. The Champagne Guide Edition VII. Hardie Grant Books, 2024.
Rose, Anthony. Fizz!: Champagne and Sparkling Wines of the World. Academie du Vin Library, 2024.
[You've probably sat the exam by now, but the books still offer solid references for any sparkling wine enthusiast and professional.]
Has anyone found further books on the subject (or had experience with any of the above)?