Articles
Fast UX Research: An Easier Way To Engage Stakeholders And Speed Up The Research Process
User Testing Articles and Videos from the Nielsen Norman Group
Books
Books that give a great introduction into the field:
Don't Make Me Think, Steve Krug (This was the book that got me into UX and changed my life!)
Books that provide great overviews of the entire research process and/or research methods:
Understanding Your Users: A Practical Guide to User Research Methods, Kathy Baxter, Catherine Courage, and Kelly Caine UX Methods: A Quick Guide to User Experience Research Methods, James Pannafino and Patrick McNeil (This is a great reference book for any level of researcher. I like to keep it handy.)
UX Research: Practical Techniques for Designing Better Products, Brad Nunnally and David Farkas
Books that aren't necessary to read, but I've found them to be helpful:
Designing Quality Survey Questions, Sheila B. Robinson and Kimberly Firth Leonard
100 Things Every Designer Needs to Know About People, Susan M. Weinschenk
Websites
Nielsen Norman Group (They've done all kinds of research on usability patterns and web design and usability testing, AND they offer all kinds of how-to articles and videos.)