O'Brien. (2000). Business measurements for safety performance. Lewis Publishers.
Lua i Stíl Chicago (17ú heag.)O'Brien. Business Measurements for Safety Performance. Boca Raton: Lewis Publishers, 2000.
Lua MLA (8ú heag.)O'Brien. Business Measurements for Safety Performance. Lewis Publishers, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.