Citáce podľa APA (7th ed.)
(1991). Economic Survey 4/91: Economic Trends in Norway. New Developments in the Perspectives for Natural Gas Trade in Europe. Economic Trends in the Nordic Countries (1. ed.). Central Bureau of Statistics of Norway.
Citácia podle Chicago (17th ed.)
Economic Survey 4/91: Economic Trends in Norway. New Developments in the Perspectives for Natural Gas Trade in Europe. Economic Trends in the Nordic Countries. 1. ed. Oslo: Central Bureau of Statistics of Norway, 1991.
Citácia podľa MLA (8th ed.)
Economic Survey 4/91: Economic Trends in Norway. New Developments in the Perspectives for Natural Gas Trade in Europe. Economic Trends in the Nordic Countries. 1. ed. Central Bureau of Statistics of Norway, 1991.
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