^Bromley, D.B. (1986) The Case-Study Method in Psychology and Related Disciplines. (Chichester, England: Wiley). ISBN 978-0471908531
^Feagin, J.R. Orum, A.M., & Sjoberg, G. (Eds.)(1991). A Case for the Case Study. (Chapel Hill, NC: University of North Carolina Press). ISBN 978-0807843215