1. Allison GT. Conceptual models and the Cuban missile crisis. Am Polit Sci Rev. 1969;63(3):689–718.
2. Bartlett L, Vavrus F. Rethinking case study research. New York: Routledge; 2017.
3. Donmoyer R. Generalizability and the single-case study. In: Gomm R, Hammersley M, Foster P, editors. Case study method- key issues, key texts. London: Sage; 2000. p. 45–68.
4. Duff PA. Case study research on language learning and use. Ann Rev Appl Linguist. 2014;34:233–55.
5. Eckstein H. Case study in theory and political science. In: Greenstein FJ, Polsby NW, editors. Handbook of political science. Reading: Addison-Wesley; 1975. p. 79–137.