A Voyage to the Isles of Exile.  http://www.theguideistanbul.com/istanbul/features/9809/avoyage.htm

Features some information and pictures about the Princes’ Islands.

Bishop, Morris.  The Middle Ages.  Boston: Houghton Mifflin Company.  1968.

Gave a very detailed description of different aspects of life in the middle ages, including an excellent description of eating habits in all classes of society. 

Byzantium 1200.  http://www.byzantium1200.org/

Provides pictures, models, and histories of buildings and architecture of Constantinople around the year 1200.  Many computer derived models on this site were used in place of pictures of destroyed buildings. 

Dunn, Ross E.  The Adventures of Ibn Battuta: A Muslim Traveler of the 14^th Century.  Los Angeles: University of California Press.  1989.

This book describes the route Ibn Battuta took through Constantinople and describes his reactions to what he sees.  Used primarily in the Rihla. 

Focus on Haghia Sophia.  http://www.focusmm.com/civilization/hagia/

Provided several pictures of the Haghia Sophia.  

Freely, John.  Blue Guide: Istanbul.  New York:  W W Norton.  1991.

A travel guide to the city of Istanbul.  Provides maps, plans, and an atlas of Istanbul and many of the buildings and monuments.  Also provides in depth histories of each site listed. 

Ingpen, Robert and Philip Wilkinson.  Encyclopedia of Mysterious Places.  New York:  Viking Studio Books.  1990. 

Provides an elaborate description of the Haghia Sophia, including quotes from prominent historians of the time that saw the building before it was converted into a mosque. 

Medieval Atlas:  Maps of Constantinople. http://historymedren.about.com/library/atlas/blatconstandex.htm

Provides several maps depicting the layout of Constantinople during the medieval age.