APA (7th ed.) Citation

Gass, S. M. (1997). Input, interaction, and the second language learner. Lawrence Erlbaum.

Chicago Style (17th ed.) Citation

Gass, Susan M. Input, Interaction, and the Second Language Learner. Mahwah, N.J.: Lawrence Erlbaum, 1997.

MLA (9th ed.) Citation

Gass, Susan M. Input, Interaction, and the Second Language Learner. Lawrence Erlbaum, 1997.