Probably the best selling introduction to social science research methods is Babbie, The Practice of Social Research, 13th Edition:.

Please see the research methodology.

• "Research Design: Qualitative, Quantitative, and Mixed Methods Approaches" by John W. Creswell (Covers the basics of different research designs and provides clear guidance on how to choose the appropriate methodology for your research.)
• "Research Methods: The Essential Knowledge Base" by William M. Trochim and James P. Donnelly (It provides a broad overview of research methodology in a clear and accessible way. The book covers topics such as research design, data collection, sampling, statistical analysis, and how to present findings. It also includes practical examples and case studies to help you apply what you learn.)