Olsen, W. E. (2010). Realist methodology. Sage Publications Inc..
Chicago Style aipamenaOlsen, Wendy Ed. Realist Methodology. London: Sage Publications Inc., 2010.
MLA aipamenaOlsen, Wendy Ed. Realist Methodology. Sage Publications Inc., 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.