Freeman, H. (1995). Industrial pollution prevention handbook. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Freeman, Harry. Industrial Pollution Prevention Handbook. New York: McGraw-Hill, 1995.
Lua MLA (8ú heag.)Freeman, Harry. Industrial Pollution Prevention Handbook. McGraw-Hill, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.