Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.

APA Citation Edition Citation

Betts, A., & Helms, S. (1989). A water harvesting and storage system at Ibn el-Ghazzi in eastern Jordan. A preliminary report.

Chicago Citation Edition Citation

Betts, A.V.G, und S. Helms. A Water Harvesting and Storage System at Ibn El-Ghazzi in Eastern Jordan. A Preliminary Report. 1989.

MLA Citation Edition Citation

Betts, A.V.G, und S. Helms. A Water Harvesting and Storage System at Ibn El-Ghazzi in Eastern Jordan. A Preliminary Report. 1989.