@Incollection{ángela2005observations,
  author = {Franco, Ángela},
  title  = {Observations on the Illustrations of the Silos Beatus Manuscript},

  year   = {2005},
  number = {},
  url    = {},

  const  = {\ text}
}
@Incollection{betschart1992zwischen,
  author = {Betschart, Andreas},
  title  = {Zwischen zwei Welten. Illustrationen in Berichten westeuropäischer Jerusalemreisender des 15. und 16. Jahrhunderts},

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

  const  = {\ text}
}