Cita APA (7th ed.)

Barker, A. (1993). Letters at work: A communication pocket guide. Industrial Society.

Cita Chicago (17th ed.)

Barker, Alan. Letters at Work: A Communication Pocket Guide. London: Industrial Society, 1993.

Cita MLA (9th ed.)

Barker, Alan. Letters at Work: A Communication Pocket Guide. Industrial Society, 1993.