1. BABBIE, Earl, The Practice of Social Research, 13. Basım, Wadsworth, Belmont, 2013.
2. BARBER, Sotirios A / FLEMİNG, James E.,Constitutional Interpretation: The Basic Questions, Oxford University Press, Oxford, 2007.
3. BLUMBERG, Boris / COOPER, Donald R / Schindler, Pamela S., Business Research Methods, McGraw-Hill, New York, 2008.
4. BURCHILL, Scott / LINKLATER, Andrew, Theories of International Relations, Palgrave Macmillan, Basingstoke, 2013.
5. CORBETTA, Piergiorgio, Social Research: Theory, Methods and Techniques, Thousand Oaks, 2003.