Billsberry, J. (1996). The effective manager: Perspectives and illustrations. Sage Publications in association with the Open University.
Lua i Stíl Chicago (17ú heag.)Billsberry, Jon. The Effective Manager: Perspectives and Illustrations. London: Sage Publications in association with the Open University, 1996.
Lua MLA (9ú heag.)Billsberry, Jon. The Effective Manager: Perspectives and Illustrations. Sage Publications in association with the Open University, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.