Craig A. (Barry University, USA) Mertler 
Introduction to Educational Research [PDF ebook] 

This Third Edition of Craig Mertler’s practical text helps readers every step of the way as they plan and execute their first educational research project. Offering balanced coverage of qualitative and quantitative methods, an emphasis on ethics, and a wealth of new examples and concrete applications, the new edition continues to use conversational, nontechnical language to help students clearly understand and apply research concepts, principles, procedures, and terminology. Expanded coverage of foundations of research, an increased focus on integrating qualitative and quantitative research, and updated coverage of research questions and the tools of qualitative research bring the book thoroughly up-to-date, while streamlined coverage of statistics shows students how to do quantitative analysis in a straightforward way.