@Book{sitereport_51562,
 author = "石川, 功 and 窪田, 恵一",
 title = "史跡　土浦城跡II",
 volume = "",
 publisher = "土浦市教育委員会",
 year = 2004,
 series = "",
 number = "",
 url = https://sitereports.nabunken.go.jp/51562,
 }