Gläser, Jochen, and Grit Laudel. “Life With and Without Coding: Two Methods for Early-Stage Data Analysis in Qualitative Research Aiming at Causal Explanations”. Forum Qualitative Sozialforschung Forum: Qualitative Social Research, vol. 14, no. 2, Mar. 2013, doi:10.17169/fqs-14.2.1886.