APA (7th ed.) Citation

Gass, S. M. (2013). Second Language Acquisition An Introductory Course 4th.

Chicago Style (17th ed.) Citation

Gass, Susan M. Second Language Acquisition An Introductory Course 4th. New York, 2013.

MLA (9th ed.) Citation

Gass, Susan M. Second Language Acquisition An Introductory Course 4th. 2013.

Warning: These citations may not always be 100% accurate.