"Appraising: The Definitive Guide Volume 2" by The Appraisers American Association is a comprehensive, 320-page guide that focuses on the world of art appraisal. 

With contributions from 54 accomplished authors, this volume features 50 in-depht articles, including 30 on connoisseurship, 11 on the business of appraising, and 9 on appraisal theory and methodology. It’s a collaborative effort that brings together some of the brightest minds in the industry.

For more information:

https://artdaily.cc/news/173877/What-s-it-worth--New-comprehensive-guide-to-appraising-fine-art-published-by-Appraisers-Association-of-America