@Book{sitereport_33629,
 author = "土井, 和幸 and 若杉, 竜太",
 title = "穴観音古墳",
 volume = "2",
 publisher = "日田市教育委員会",
 year = 2004,
 series = "日田地区遺跡群発掘調査報告/日田市埋蔵文化財調査報告書",
 number = "55",
 url = https://sitereports.nabunken.go.jp/33629,
 }