Schenkel, W. (1998). From clean air to climate policy in the Netherlands and Switzerland--same problems, different strategies? Peter Lang.
Chicago-referens (17:e uppl.)Schenkel, Walter. From Clean Air to Climate Policy in the Netherlands and Switzerland--same Problems, Different Strategies? Bern ; New York: Peter Lang, 1998.
MLA-referens (8:e uppl.)Schenkel, Walter. From Clean Air to Climate Policy in the Netherlands and Switzerland--same Problems, Different Strategies? Peter Lang, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.