Swaan, W. (1969). Die grossen Kathedralen: : Albi, Amiens, Bourges, Burgos, Canterbury, Chartres, Coutances, Ely, Florenz, Freiburg, Gloucester, Köln, Laon, Leon, Lincoln, Mailand, Orvieto, Palma de Mallorca, Pamplona, Paris, Peterborough, Reims, Regensburg, Rouen, Salisbury, Sevilla, Siena, Strassburg, Toledo, Ulm, Wells, Wien, York. DuMont Schauberg.
Chicago Style (17th ed.) CitationSwaan, Wim. Die Grossen Kathedralen: : Albi, Amiens, Bourges, Burgos, Canterbury, Chartres, Coutances, Ely, Florenz, Freiburg, Gloucester, Köln, Laon, Leon, Lincoln, Mailand, Orvieto, Palma De Mallorca, Pamplona, Paris, Peterborough, Reims, Regensburg, Rouen, Salisbury, Sevilla, Siena, Strassburg, Toledo, Ulm, Wells, Wien, York. Köln: DuMont Schauberg, 1969.
MLA (9th ed.) CitationSwaan, Wim. Die Grossen Kathedralen: : Albi, Amiens, Bourges, Burgos, Canterbury, Chartres, Coutances, Ely, Florenz, Freiburg, Gloucester, Köln, Laon, Leon, Lincoln, Mailand, Orvieto, Palma De Mallorca, Pamplona, Paris, Peterborough, Reims, Regensburg, Rouen, Salisbury, Sevilla, Siena, Strassburg, Toledo, Ulm, Wells, Wien, York. DuMont Schauberg, 1969.