Book shop

Book Shops were suppliers of books and maps in the cities of Constantinople and Cappadocia during the early 16th century.

Constantinople

 * The Odyssey by Homer
 * Aeneid by Virgil
 * Mu'allaqat
 * Geography by Ptolemy
 * The History of the Kings of Britain by Geoffrey of Monmouth
 * Heimskringla by Snorri Sturluson
 * The Book of Prophecies by Christopher Columbus
 * The Golden Ass by Apeleius
 * Parallel Lives by Plutarch
 * Metamorphoses by Ovid
 * Opus Majus by Roger Bacon
 * The Secret History of the Mongols
 * Anabasis Alexandri by Arrian of Nicodemia
 * Record of the Grand Historian by Sima Qian

Cappadocia

 * Bibliotheca
 * Cronica
 * Tirant lo Blanch
 * Digenes Akritas

Book quests
After completing the memory "Signs and Symbols, Part I", Ezio Auditore found the following books scattered throughout Constantinople with his Eagle Vision.
 * The Canterbury Tales by Geoffrey Chaucer
 * The Travels of Marco Polo by Marco Polo
 * One Thousand and One Nights by an unknown author
 * The Book of Kings by an unknown author
 * Nibelungenlied by an unknown author
 * Iliad by Homer
 * The Flute Girl by an unknown author

After finding and purchasing all books, a cutscene involving bookshop owner Sofia Sartor and Ezio Auditore is unlocked at the Assassin hideout.

Trivia

 * Book Shops and books have replaced the functions of Art Merchants and paintings from Assassin's Creed II and Assassin's Creed: Brotherhood.
 * Buying every book available from the Book Shops in Constantinople and Cappadocia, along with finding all the hidden books from Polo Memories, unlocks the 'Sage' achievement/trophy.

Source

 * Assassin's Creed: Revelations