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
"Spray, P. R. (Paul R.)",Botswana as a beef exporter,,"National Institute of Development and Cultural Research, Documentation Unit, University College of Botswana, University of Botswana and Swaziland",1981,Working paper,,,,https://cir.nii.ac.jp/crid/1130282268725958784