Payne, W. (1981). Denitrification. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Payne, W.J. Denitrification. John Wiley and Sons, 1981.
Lua MLA (9ú heag.)Payne, W.J. Denitrification. John Wiley and Sons, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.