The Basics of Social Research
I read a fair bit of this book for my undergraduate thesis and I really enjoyed it. It gives a good primer on how and why social research works. Dense enough that it should probably be made into a companion video course for people who don't like reading textbooks.
Babbie, Earl. The Basics of Social Research. 4th Edition, Instructor's Edition. Belmont, CA: Thomson Wadsworth, 2008. Printed Book.