A Companion to the Enlightenment John W. Yolton (Editor), Pat Rogers (Editor), Roy Porter (Editor), Barbara Stafford (Editor) ISBN: 978-0-631-19688-4 Paperback 592 pages January 1991, Wiley-Blackwell List Price: US $137.95 Government Price: US $79.31 Enter Quantity:   Buy This is a Print-on-Demand title. It will be printed specifically to fill your order. Please allow an additional 10-15 days delivery time. The book is not returnable.