APA-referens (7:e uppl.)

Roewer, U. (2008). Environmental Protection Expenditure by Industry in the European Union 1997-2004. Statistic in focus: Environment and energy.

Chicago-referens (17:e uppl.)

Roewer, Ute. "Environmental Protection Expenditure by Industry in the European Union 1997-2004." Statistic in Focus: Environment and Energy 2008.

MLA-referens (8:e uppl.)

Roewer, Ute. "Environmental Protection Expenditure by Industry in the European Union 1997-2004." Statistic in Focus: Environment and Energy, 2008.