Encyclopedias are great for:
Oxford bibliographies. Islamic studies
Peer-reviewed annotated bibliographies on the range of lived experiences and textual traditions of Muslims as they are articulated in various countries and regions throughout the world.
Oxford Handbooks Online: Scholarly Research Reviews
Includes such titles as: The Oxford handbook of Islam and politics  The Oxford handbook of the history of nationalism 2013 The Oxford handbook of Iranian history c2012
Multi-disciplinary reference work. All aspects of the land, life, culture and history of all Iranian peoples and their interaction with other societies. IN PROGRESS.
The Routledge handbook of modern Turkey. edited by Metin Heper and Sabri Sayarı. New York : Routledge, 2012. (Olin Library Oversize DR417 .R58 2012 +)
Selected English Bibliographies of Primary & Secondary Sources
Approaching Ottoman history: an introduction to the sources Suraiya Faroqhi. New York : Cambridge University Press, 1999
Bibliography of Ottoman history Stanford J. Shaw. [Cambridge? Mass. : s.n., 1964?] (Uris Library A.D. White Z2846 .S53+)
See excellent bibliographies in relevant chapters of Cambridge Histories Online.
Historical dictionary of Turkey. Metin Heper. Metuchen, N.J. : Scarecrow Press, 1994. (Olin Library DR436 .H47x 1994
Palestine and Egypt under the Ottomans: paintings, books, photographs, maps and manuscripts. Hisham Khatib. Published: London ; New York : Tauris Parke, 2003.
The Ottoman city in comparative perspective, Istanbul, 1453-1923 : a selected bibliography of urban history, compiled from Western sources Engin Yenal. Monticello, Ill. : Vance Bibliographies, 1978. (Library Annex Z5941 .V22 no.14)
Bibliography on manuscript libraries in Turkey and the publications on the manuscripts located in these libraries. edited by Ekmeleddin İhsanoğlu ; prepared by Nimet Bayraktar and Mihin Lugal. Istanbul : Research Centre for Islamic History, Art, and Culture (IRCICA), 1995. (Uris Library A.D. White Z845.T9 B5 1995z)
The Middle East in microform: a union list of Middle Eastern microforms in North American libraries. compiled by Fawzi W. Khoury and Michele S. Bates. Seattle, Wash. : University of Washington Libraries, 1991. (Library Annex + Z3015 .K48x 1991)