Stake, R. E. (1995). The art of case study research. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Stake, Robert E. The Art of Case Study Research. Thousand Oaks: Sage Publications, 1995.
Lua MLA (9ú heag.)Stake, Robert E. The Art of Case Study Research. Sage Publications, 1995.
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