Fricke, W. (2004). Population shifts and migration in the Sahel and Sub-Sudan zone of West Africa reviewed from the aspect of human carrying capacity. Biological resources and migration.
Chicago-Zitierstil (17. Ausg.)Fricke, Werner. "Population Shifts and Migration in the Sahel and Sub-Sudan Zone of West Africa Reviewed from the Aspect of Human Carrying Capacity." Biological Resources and Migration 2004.
MLA-Zitierstil (9. Ausg.)Fricke, Werner. "Population Shifts and Migration in the Sahel and Sub-Sudan Zone of West Africa Reviewed from the Aspect of Human Carrying Capacity." Biological Resources and Migration, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.