+ wishlist The Sounds of the World's Languages (Phonological Theory) [9780631198154] Add to Cart The item has been added Author: Peter Ladefoged Ian Maddieson The Sounds of the World's Languages (Phonological Theory) [9780631198154] Buy More - Save More. Below are the available bulk discount rates for each individual item when you purchase a certain amount Quantity Price Savings 25 - 49 4% 50 - 99 5% 100+ 6% List Price As Low as $92.95 Format: Paperback