This is a revised and expanded edition of Cowan and Rakusan’s Source Book for Linguistics. In addition to the chapters on Phonetics, Phonology, Phonological Alternations, Morphology, Syntax, Sound Change and Historical Reconstruction, there are two new chapters: one on Semantics and one on Grammatical and Lexical Change. In addition, an index of the 93 languages and dialects represented in the book has been added, as well as a revised bibliography. The solutions to the exercises have also been revised and expanded. The number of exercises has been increased from 333 to 472. New exercises have been added to most chapters, and many exercises have been revised to focus on new issues in linguistics. The text has been completely reset in high-quality letterpress, with a wide range of phonetic symbols and diacritics. This newly revised edition will continue to be useful as a teaching tool and a source of examples in a variety of linguistic applications.