@incollection{cronegenuamauros,
  address = {Genua},
  author = {Crone, Gerald R.},
  booktitle = {V. Centenario della nascita de Cristofero Colombo. Convegni internazionale di studi colombiani},
  interhash = {3bee30a0599ebe17c9de75dc318269ad},
  intrahash = {bb8bd943eef2f07120094c2d30c2a4e4},
  pages = {57-64},
  title = {Fra Mauro’s representation of the Indian Ocean and the eastern islands,},
  volume = 3,
  year = {Genua}
}

@book{crone1962their,
  address = {London},
  author = {Crone, Gerald R.},
  edition = {2. durchges. Aufl.},
  interhash = {99d8ad72de861840e48d99fec6f5a09f},
  intrahash = {691e4d1262ce2fd07d63fb2a0ad90e76},
  pages = { S. 9-109; 184-192},
  title = {Maps and their Makers. An Introduction to the History of Cartography},
  year = 1962
}