توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

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

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

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

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

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