Gamlen, A., & McIntyre, C. (2018). Mixing methods to explain emigration policies: A postpositivist perspective. Journal of Mixed Methods Research, 12(4), 374–393. https://doi.org/10.1177/1558689818782822

Gamlen and McIntyre (2018) demonstrate effective integration of multiple diverse methods, including archive/document searches, statistical analyses, analysis of key informant interviews and public statements, geospatial mapping and event history analysis within a post-positivist framework to build a causal analysis explaining how and why states establish formal diaspora institutions devoted to emigrants and their descendants.

Fàbregues, S., & Molina-Azorín, J. (2017). Addressing quality in mixed methods research: A review and recommendations for a future agenda. Quality & Quantity, 51, 2847–2863. https://doi.org/10.1007/s11135-016-0449-4

Fàbregues and Molina-Azorín (2017) review studies putting forward quality criteria for mixed methods research and provide a summary of the most common criteria proposed.