Cita APA (7a ed.)

Hopkins, A., & Potter, J. (1997). Look ahead classroom course: Intermediate student's book. Longman.

Cita Chicago Style (17a ed.)

Hopkins, Andy, y Jocelyn Potter. Look Ahead Classroom Course: Intermediate Student's Book. Haslow: Longman, 1997.

Cita MLA (9a ed.)

Hopkins, Andy, y Jocelyn Potter. Look Ahead Classroom Course: Intermediate Student's Book. Longman, 1997.