Cita APA (7th ed.)

Hopkins, A., & Potter, J. (1997). Work in progress: Course book. Longman.

Cita Chicago (17th ed.)

Hopkins, Andy, i Jocelyn Potter. Work in Progress: Course Book. Harlow: Longman, 1997.

Cita MLA (8th ed.)

Hopkins, Andy, i Jocelyn Potter. Work in Progress: Course Book. Longman, 1997.