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Hugh Kennedy - The Prophet and the Age of the Caliphates

Martin Lings - Muhammad: his life based on the éarliest sources

John Lewis Burckhardt (Johann Ludwig Burckhardt) - Travels in Arabia; comprehending an account of those territories in Hedjaz which the Mohammedans * regard as sacred, online version available free from Project Gutenberg here.

Pars Tuğlacı – Osmanlı Şehirleri

Michael Asher - Lawrence: The Uncrowned King of Arabia

David Holden and Richard Jones - The House of Saud