@Book{sitereport_101713,
 author = "群馬県教育委員会, ",
 title = "史跡観音山古墳",
 volume = "",
 publisher = "群馬県教育委員会",
 year = 0,
 series = "",
 number = "",
 url = https://sitereports.nabunken.go.jp/101713,
 }