APA (7th ed.) Citation

Hamel, J., Dufour, S., & Fortin, D. (1993). Case study methods. Qualitative research methods.

Chicago Style (17th ed.) Citation

Hamel, Jacques, Stéphane Dufour, and Dominic Fortin. "Case Study Methods." Qualitative Research Methods 1993.

MLA (9th ed.) Citation

Hamel, Jacques, et al. "Case Study Methods." Qualitative Research Methods, 1993.