@Book{sitereport_61180,
 author = "剱持, 直樹 and 水谷, 貴之",
 title = "中之条町指定史跡　内山城址　桑田城址",
 volume = "",
 publisher = "中之条町教育委員会",
 year = 2012,
 series = "中之条町埋蔵文化財発掘調査報告書",
 number = "21",
 url = https://sitereports.nabunken.go.jp/61180,
 }