@Book{sitereport_59510,
 author = "沢田, 康夫",
 title = "観音山古墳群",
 volume = "",
 publisher = "那珂川町教育委員会",
 year = 1980,
 series = "那珂川町文化財調査報告書",
 number = "6",
 url = https://sitereports.nabunken.go.jp/59510,
 }