APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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