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
"Egudu, Romanus N. and Nwoga, Donatus Ibe",Poetic heritage : Igbo traditional verse,,Nwankwo-Ifejika,1971,Unesco collection of representative works,,,,https://cir.nii.ac.jp/crid/1130003902349929856