Roselle and Spray (2011, 5) suggest some sources that may be useful to search for your research topic:

• Textbooks

• Scholarly literature Literature Literature can be defined as published study such as articles, books, dissertations, research reports, etc. 

• Some scholarly articles that contain listings of particular groups of cases (e.g., war, conflict, crises, particular negotiations, etc.).

• Some scholarly websites which contain the databases you can explore

• Websites of respected international organizations such as International Monetary Fund, International Labor Organization; intergovernmental organizations such as United Nations and the World Trade Organization.

• Websites of governmental and nongovernmental organizations.

• Websites of government agencies such as Ministry of Foreign Affairs, Presidency of the Republic of Turkey.

• Reference books such as almanacs and books that contain helpful listings of the related field.