BROWN L R. (2000). VITAL SIGNS 2000-2001: ENVIRONMENTAL TRENDS THAT ARE SHAPING OUR FUTURE. EARTHSCAN.
Chicago-referens (17:e uppl.)BROWN L R. VITAL SIGNS 2000-2001: ENVIRONMENTAL TRENDS THAT ARE SHAPING OUR FUTURE. LONDON: EARTHSCAN, 2000.
MLA-referens (9:e uppl.)BROWN L R. VITAL SIGNS 2000-2001: ENVIRONMENTAL TRENDS THAT ARE SHAPING OUR FUTURE. EARTHSCAN, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.