(1990). OSHA handbook for small businesses.
Lua i Stíl Chicago (17ú heag.)OSHA Handbook for Small Businesses. 1990.
Lua MLA (9ú heag.)OSHA Handbook for Small Businesses. 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.