Robert J. Wright 
Research Methods for Counseling : An Introduction [PDF ebook] 
An Introduction

This text provides a rich, culturally sensitive presentation of current research techniques in counseling. Author Robert J. Wright introduces the theory and research involved in research design, measurement, and assessment with an appealingly clear writing style. He addresses ways to meet the requirements of providing the data needed to facilitate evidence-based therapy and interventions with clients, and also explains methods for the evaluation of counseling programs and practices. This comprehensive resource covers a broad range of research methods topics including qualitative research, action research, quantitative research including, sampling and probability, and probability-based hypothesis testing. Coverage of both action research and mixed methods research designs are also included.