Gass, Susan M. Second language acquisition : an introductory course / Susan M. Gass with Jennifer Behney and Luke Plonsky. - 4th ed. - New York : Routledge, c2013. - xxiv, 623 pages ; 27 cm. Includes bibliographical references and indexes. ISBN: 9780415894784 9780415894951 9780203137093 Subjects--Topical Terms: Second language acquisition. Dewey Class. No.: 418 GAS