Principles of Linguistic Change, Volume I, Internal Factors William Labov ISBN: 978-0-631-17914-6 Paperback 664 pages July 1994, Wiley-Blackwell US $48.95 Add to Cart This price is valid for United States. Change location to view local pricing and availability. This is a Print-on-Demand title. It will be printed specifically to fill your order. Please allow an additional 2-3 days delivery time. The book is not returnable.