@incollection{rahel2008papst,
  author = {Oesterle, Jenny Rahel},
  title = {Papst – Kalif – König. Vergleiche sakraler Herrschaftsformen im Spiegel islamischer und christlicher Quellen des Mittelalters und moderner Forschung},
  booktitle = {Transkulturelle Komparatistik. Beiträge zu einer Globalgeschichte der Vormoderne},
  year = {2008},
  pages = {57-72}
}

@article{nazmialharita,
  author = {Nazmi, Ahmad},
  title = {“Al-Harita al-Ma’muniyya”. The Islamic World Map of Al-Ma’mun and the Islamic Cartography},
  journal = {Rocznik orientalistyczny},
  year = {2004},
  volume = {57},
  pages = {77-95}
}

@article{rapoportyossefsavagesmith2004medieval,
  author = {Rapoport, Yossef and Savage-Smith, Emilie},
  title = {Medieval Islamic View of the Cosmos: The Newly discovered Book of Curiosities},
  journal = {The Cartographic Journal },
  year = {2004},
  volume = {41},
  number = {3},
  pages = {253-259}
}

@article{yossef2004medieval,
  author = {Rapoport, Yossef and Savage-Smith, Emilie},
  title = {Medieval Islamic View of the Cosmos: The Newly Discovered Book of Curiosities},
  journal = {The Cartographical Journal},
  year = {2004},
  volume = {41},
  pages = {253-259}
}