Earlier today I was looking at the free digital version of The Researcher's Guide to American Genealogy. It's offered through Scribd so I decided to poke around the website and see what other genealogy books they had available. As it turns out, the site has a lot of genealogy material, including presentations by libraries, genealogies and a couple books.
One of the books I came across was Basics of Genealogy Reference: A Librarian's Guide. While written for librarians who will be assisting patrons with genealogy, it's also a good reference for those looking for more avenues to take their research.
Basics of genealogy reference a librarian’s guide