hartwick, J. M. (1989). Non-Renewable resources extraction programs and markets. Harwood academic Pub.
Chicago Edition Citationhartwick, John M. Non-Renewable Resources Extraction Programs and Markets. Chur: Harwood academic Pub, 1989.
ציטוט MLAhartwick, John M. Non-Renewable Resources Extraction Programs and Markets. Harwood academic Pub, 1989.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.