I don't know of any book titles, but I have to believe that someone wrote a book discussing the 4-day work week. If the usual places don't have it for sale, maybe a PDF version of some book about the 4-day work week exists for a download.
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You can check amazon for "The 4 Day Week: How the Flexible Work Revolution Can Increase Productivity, Profitability and Well-being, and Create a Sustainable Future" by Andrew Barnes. The book is on how companies are going to push the workers to work remotely and in the process the traditional work hours and work days would be adjusted.