United Nations. Economic Commission for Europe. (1993). Solar Power Systems. United Nations.
Chicago-referens (17:e uppl.)United Nations. Economic Commission for Europe. Solar Power Systems. New York: United Nations, 1993.
MLA-referens (9:e uppl.)United Nations. Economic Commission for Europe. Solar Power Systems. United Nations, 1993.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.