Cita APA (7a ed.)

Roberts, E. L. A. (1989). Tactic 1. Student's book. MacMmillan Publishers Limited.

Cita Chicago Style (17a ed.)

Roberts, E L Autor. Tactic 1. Student's Book. 2-Londres,Inglaterra: MacMmillan Publishers Limited, 1989.

Cita MLA (9a ed.)

Roberts, E L Autor. Tactic 1. Student's Book. MacMmillan Publishers Limited, 1989.