Cita APA (7a ed.)

Jones,Carolyn, Hopkins,Andy, & Potter,Jocelyn. (1997). Look a head: Workbook 2. Longman.

Cita Chicago Style (17a ed.)

Jones,Carolyn, Hopkins,Andy, y Potter,Jocelyn. Look a Head: Workbook 2. Longman, 1997.

Cita MLA (8a ed.)

Jones,Carolyn, et al. Look a Head: Workbook 2. Longman, 1997.