North Klaus. (1997). Environmental business management: An Introduction (2nd (revised).). International Labour Office.
Chicago-referens (17:e uppl.)North Klaus. Environmental Business Management: An Introduction. 2nd (revised). Geneva: International Labour Office, 1997.
MLA-referens (9:e uppl.)North Klaus. Environmental Business Management: An Introduction. 2nd (revised). International Labour Office, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.