Seppelt, R. (2003). Computer-Based Enviromental ManagementRalf Seppelt. Wiley-VCH.
Lua i Stíl Chicago (17ú heag.)Seppelt, Ralf. Computer-Based Enviromental ManagementRalf Seppelt. Wiley-VCH, 2003.
Lua MLA (8ú heag.)Seppelt, Ralf. Computer-Based Enviromental ManagementRalf Seppelt. Wiley-VCH, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.