Secret Vice : Tolkien on Invented Languages, Paperback by Tolkien, J. R. R.; Fimi, Dimitra (EDT); Higgins, Andrew (EDT), ISBN 0008131414, ISBN-13 9780008131418, Like New Used, Free P&P in the UK

First ever critical study of Tolkien's little-known essay, which reveals how language invention shaped the creation of Middle-earth and beyond, to George R R Martin's Game of Thrones.