Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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.

Παραπομπή σε μορφή MLA (8th εκδ.)

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.