The references selected here focus on qualitative methods in empirical migration research. The selection criteria is the emphasis on combining qualitative approaches to quantitative data analysis. If you're interested in Cause and Effect Topics, don't hesitate to check for information at the main page of the site.

• Borkert, Maren; Martín Pérez, Alberto; Scott, Sam & De Tona, Carla (2006):
  Introduction: Understanding Migration Research (Across National and Academic Boundaries) in Europe
  Published online in: Forum Qualitative Sozialforschung / Forum: Qualitative Social Research [On-line Journal], 7(3), Art. 3

• Singleton A. (1999):
  Combining quantitative and qualitative research methods in the study of international migration
  Source: International Journal of Social Research Methodology, Volume 2, Number 2, 1 April 1999, pp. 151-157(7), Publisher: Routledge, part of the Taylor & Francis Group