@Book{sitereport_89,
 author = "冨沢, 一明",
 title = "春日居館跡",
 volume = "",
 publisher = "佐久市教育委員会 and 佐久市教育委員会文化財課",
 year = 2011,
 series = "佐久市埋蔵文化財調査報告書",
 number = "187",
 url = https://sitereports.nabunken.go.jp/89,
 }