Schenkel, W. (1998). From clean air to climate policy in the Netherlands and Switzerland--same problems, different strategies? Peter Lang.
Lua i Stíl Chicago (17ú heag.)Schenkel, Walter. From Clean Air to Climate Policy in the Netherlands and Switzerland--same Problems, Different Strategies? Bern ; New York: Peter Lang, 1998.
Lua MLA (8ú heag.)Schenkel, Walter. From Clean Air to Climate Policy in the Netherlands and Switzerland--same Problems, Different Strategies? Peter Lang, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.