Brooks, I. (1997). The business environment: Challenges and changes. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Brooks, Ian. The Business Environment: Challenges and Changes. London: Prentice Hall, 1997.
Lua MLA (9ú heag.)Brooks, Ian. The Business Environment: Challenges and Changes. Prentice Hall, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.