Jakob, Alexander. “On the Triangulation of Quantitative and Qualitative Data in Typological Social Research: Reflections on a Typology of Conceptualizing ‘Uncertainty’ in the Context of Employment Biographies”. Forum Qualitative Sozialforschung Forum: Qualitative Social Research, vol. 2, no. 1, Feb. 2001, doi:10.17169/fqs-2.1.981.