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Johnson, R.B., Russo, F., & Schoonenboom, J. (in press). Toward a pluralistic theory of causation for mixed methods research: The metting of philosophy, science, and practice. Journal of Mixed Methods Research.

Provides an extensive range of approaches to causal theorising, which they describe from philosophical, scientific, and practical perspectives.

Bryman, A. (2007). Barriers to integrating quantitative and qualitative research. Journal of Mixed Methods Research, 1(1), 8-22. doi: 10.1177/2345678906290531

Presents results from 20 interviews with researchers with mixed methods experience on barriers to integration in conducting and especially in writing up mixed methods research.