Walliman, N. S. & Walliman N. (2011) “Research methods: the basics” Taylor and Francis
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Methodology and method are not interchangeable. In recent years however, there has been a tendency to use methodology as a "pretentious substitute for the word method ".  Using methodology as a synonym for method or set of methods leads to confusion and misinterpretation and undermines the proper analysis that should go into designing research. 
Schön, David (1983). The Reflective Practitioner: How Professionals Think in Action. Basic Books.