توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Sippel, M. (2004). Global Climate Policy and Correspondending Activies on a City-Level: A Case of Hamburg and Its Citypartnerships With a Special Focus on CDM-Potentials.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Sippel, Maike. Global Climate Policy and Correspondending Activies on a City-Level: A Case of Hamburg and Its Citypartnerships With a Special Focus on CDM-Potentials. Hamburg, 2004.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Sippel, Maike. Global Climate Policy and Correspondending Activies on a City-Level: A Case of Hamburg and Its Citypartnerships With a Special Focus on CDM-Potentials. 2004.