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 "Letschert, J. P. W.","Beta section Beta : biogeographical patterns of variation, and taxonomy",,Wageningen Agricultural University,1993,Wageningen Agricultural University papers,,9067543209,,https://cir.nii.ac.jp/crid/1130282269780151296