@book{
  author = "民事法研究会",
  title = "民法(債権関係)の改正に関する検討事項",
  year: 2011
  month: 1
  key = "債権法",
  publisher = "民事法研究会",
  address = "東京",
  ISSN/ISBN = "9784896286618 [4896286618]",
}