Gaya APA

Leenders, M, R., Erskine, J, A. (1978). Case research : the case writing process (ed. 2). London: Research and Publications Division.

Gaya MLA

Leenders, Michiel, R., Erskine, James, A. "Case research : the case writing process". ed. 2 London: Research and Publications Division, 1978. Text.