@Incollection{j.2009travel,
  author = {Flint, Valerie I. J.},
  title  = {Travel Fact and Travel Fiction in the Voyages of Columbus},

  year   = {2009},
  number = {},
  url    = {},

  const  = {\ text}
}
@Incollection{simek1992kosmos,
  author = {Simek, Rudolf},
  title  = {Erde und Kosmos im Mittelalter. Das Weltbild vor Kolumbus},

  year   = {1992},
  number = {},
  url    = {},

  const  = {\ text}
}
@Incollection{nebenzahl1990kolumbusatlas,
  author = {Nebenzahl, Kenneth},
  title  = {Der Kolumbusatlas. Karten aus der Frühzeit der Entdeckungsreisen},

  year   = {1990},
  number = {},
  url    = {},

  const  = {\ text}
}
@Incollection{noauthororeditor1956terrae,
  author = {Hennig, Richard},
  title  = {Terrae incognitae. Eine Zusammenstellung und kritische Bewertung der wichtigsten vorcolumbischen Entdeckungsreisen an Hand der darüber vorliegenden Originalberichte},

  year   = {1956},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{almagi1940mappamondi,
  author = {Almagia, Roberto},
  title  = {I mappamondi di Enrico Martello e alcuni concetti geografici di Cristoforo Colombo},
  journal = {La Bibliofilia},
  year   = {1940},
  number = {},
  url    = {},

  const  = {\ text}
}