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Johnson, R.B., & Onwuegbuzie, A.J. (2004). Mixed methods research: a research paradigm whose time has come. Educational Researcher, 33(7), 14-26.

Argues for mixed methods as a third major methodological approach (adding to quantitative and qualitative methodologies). Its basis in pragmatism is well described.

Maxwell, J.A. (2016). Expanding the history and range of mixed methods research. Journal of Mixed Methods Research, 10(1), 12-27. doi: 10.1177/1558689815571132

Argues that integrated mixed methods have been practiced unproblematically for at least the last two centuries – well before the currently claimed dawn of mixed methods. He draws lessons about strategies for integration from actual examples of studies in disciplines as diverse as geology, ethology and social science.