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
"Russell, P. E. (Peter Edward)","Portugal, Spain, and the African Atlantic, 1343-1490 : chivalry and crusade from John of Gaunt to Henry the Navigator",,Variorum,1995,Collected studies series,,0860784746,,https://cir.nii.ac.jp/crid/1130000794321896832