(1993). Mcgraw-hill Encyclopedia Of Environmental Science & Engineering Editors In Chief: Sybil P.parker, Robert A. Carbitt. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Mcgraw-hill Encyclopedia Of Environmental Science & Engineering Editors In Chief: Sybil P.parker, Robert A. Carbitt. McGraw-Hill, 1993.
Lua MLA (8ú heag.)Mcgraw-hill Encyclopedia Of Environmental Science & Engineering Editors In Chief: Sybil P.parker, Robert A. Carbitt. McGraw-Hill, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.