توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Kemper, K. E. (1996). The cost of free water: Water resources allocation and use in the Curu Valley, Ceará, Northeast Brazil. Water and Environmental Studies, Linköping University.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Kemper, Karin E. The Cost of Free Water: Water Resources Allocation and Use in the Curu Valley, Ceará, Northeast Brazil. Linköping, Sweden: Water and Environmental Studies, Linköping University, 1996.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Kemper, Karin E. The Cost of Free Water: Water Resources Allocation and Use in the Curu Valley, Ceará, Northeast Brazil. Water and Environmental Studies, Linköping University, 1996.