著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Duraiappah, Anantha K. and Perkins, Jeremy S.",Sustainable livestock management in the Kalahari: an optimal livestock rangeland model (ORL),,"vrije Universiteit,International Institute for Environment and Development",1999,CREED working paper series,,,,https://cir.nii.ac.jp/crid/1130282272250791808