(1998). Waste Management Concepts Ed. Neal K. Ostler, John T. Nielsen. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Waste Management Concepts Ed. Neal K. Ostler, John T. Nielsen. Prentice-Hall, 1998.
Lua MLA (8ú heag.)Waste Management Concepts Ed. Neal K. Ostler, John T. Nielsen. Prentice-Hall, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.