United Nations. Economic Commission for Europe. (1991). Energy reforms in Central and Eastern Europe: The first year. United Nations.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումUnited Nations. Economic Commission for Europe. Energy Reforms in Central and Eastern Europe: The First Year. New York: United Nations, 1991.
MLA (9րդ խմբ.) ՄեջբերումUnited Nations. Economic Commission for Europe. Energy Reforms in Central and Eastern Europe: The First Year. United Nations, 1991.