United Nations. Economic Commission for Europe. (1993). Solar Power Systems. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations. Economic Commission for Europe. Solar Power Systems. New York: United Nations, 1993.
Citatione MLA (9a ed.)United Nations. Economic Commission for Europe. Solar Power Systems. United Nations, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.