The correct answer is ​Granville Austin.

• The book 'Working a Democratic Constitution' was authored by the Granville Austin.

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• About the book 'Working a Democratic Constitution':
  • ​​This important book offers critical insights into four decades of the Indian Constitution.
  • It charts the course of constitutional reform in India from the euphoric idealism of the post-independence period, through the crisis years of emergency, and up to Rajiv Gandhi's brief stay in power.
  • It is intended as a story of how the social, political, and day-to-day-life realities of the Indian people have been reflected in, and in turn directed the course of, constitutional reforms in the country.
  • Austin’s book is a must-read for anyone who would like the answer to the question that how is India still on track?

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• About the author Granville Austin:
  • Granville Austin was an American historian.
  • Austin is the author of two primary political histories of the constitution of India:
    • The Indian Constitution: Cornerstone of a Nation and 
    • Working a Democratic Constitution: The Indian Experience.