@Book{sitereport_58587,
 author = "吉岡, 賢生",
 title = "観音山古墳群",
 volume = "5",
 publisher = "那珂川町教育委員会",
 year = 2000,
 series = "那珂川町文化財調査報告書",
 number = "50",
 url = https://sitereports.nabunken.go.jp/58587,
 }