This page provides an overview of two bestselling textbooks on second language acquisition. The first book, 'Second Language Acquisition: An Introductory Course, Third Edition' by Susan M. Gass and Larry Selinker, covers a range of areas of second language research including sociolinguistic, psycholinguistic, and linguistic perspectives. The second book, 'Introducing Second Language Acquisition' by Muriel Saville-Troike, is a clear and practical introduction to second language acquisition, explaining how a second language is acquired, what the learner needs to know, and why some learners are more successful than others. Both books are written for students encountering the topic for the first time and provide discussion questions and/or problems for students to put their knowledge to use.