Cita APA (7a ed.)

Gass, S. M., & Selinker, L. (1994). Second language acquisition: An introductory course. Lawrence Erlbaum.

Cita Chicago Style (17a ed.)

Gass, Susan M., y Larry Selinker. Second Language Acquisition: An Introductory Course. Hillsdale, New Jersey [etc.]: Lawrence Erlbaum, 1994.

Cita MLA (9a ed.)

Gass, Susan M., y Larry Selinker. Second Language Acquisition: An Introductory Course. Lawrence Erlbaum, 1994.