hartwick, J. M. (1989). Non-Renewable resources extraction programs and markets. Harwood academic Pub.
Chicago Zitierstilhartwick, John M. Non-Renewable Resources Extraction Programs and Markets. Chur: Harwood academic Pub, 1989.
MLA Zitierstilhartwick, John M. Non-Renewable Resources Extraction Programs and Markets. Harwood academic Pub, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.