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 Great Britain. Ordnance Survey,The Black Mountains : Abergavenny = Mynyddoedd Duon : y Fenni,,Ordnance Survey,2003,OS landranger map,,0319227618,,https://cir.nii.ac.jp/crid/1130282269681748608