@Book{sitereport_100820,
 author = "竹田市教育委員会, ",
 title = "史跡岡城跡",
 volume = "21",
 publisher = "竹田市教育委員会",
 year = 2004,
 series = "",
 number = "",
 url = https://sitereports.nabunken.go.jp/100820,
 }