The Ottoman Turks

• W. L. Langer and R. P. Blake, "The rise of the Ottoman Turks and its historical background," American Historical Review 37 (1932), 468-505 (available online)
• Petkov 454-456 and 456-465
  
• see a brief introduction to the origins and a map of the Ottoman empire
• see a picture of the Uc Serefeli mosque in Adrianople (Edirne), one of the first monuments of Ottoman architecture in the Balkans