@book{vonhouwald1980sumu,
  address   = {Managua},
  author    = {von Houwald, Göts Freiherr},
  pages     = {7+133},
  publisher = {Ministerio de Educación},
  title     = {Diccionario Español-Sumu, Sumu-Español},
  year      = {1980}
}