Krause, F. (1985). The Soft path perspective. Environment Liaison Centre in co-operation with the International Project for Soft Energy Paths.
Chicago-referens (17:e uppl.)Krause, Florentin. The Soft Path Perspective. Nairobi: Environment Liaison Centre in co-operation with the International Project for Soft Energy Paths, 1985.
MLA-referens (9:e uppl.)Krause, Florentin. The Soft Path Perspective. Environment Liaison Centre in co-operation with the International Project for Soft Energy Paths, 1985.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.