Noah R. Feldman’s Constitutional Law Book, 20th Edition in hardcover format, is a comprehensive textbook authored by Noah Feldman and Kathleen Sullivan. Published by West Academic in the United States in 2019, this textbook focuses on the subject area of Constitutional Law. It is written in English and serves as a key resource for students and professionals interested in studying constitutional principles and laws. The hardcover format ensures durability and longevity of this valuable educational tool.