Good instructional books for bluegrass guitar tabs include "The Great American Country Songbook (Easy Guitar with Notes & Tab)" and "Country Classics for Easy Guitar (Easy Guitar with Notes & Tab)." Find instructional resources for bluegrass tab music on Amazon.com, FlatPickingTabs.com or BluegrassGuitar.com as of 2015.
Amazon.com features a range of country, bluegrass and gospel song books with tabs, notes, lyrics and more. The skill level required to play the songs varies, and many books cater to beginner guitarists. Meanwhile, FlatPickingTabs.com and BluegrassGuitar.com offer free tab music.
In general, tabs simplify learning to play songs and can be helpful for guitar players who prefer not to read music. Guitar tabs might not be completely accurate for a song but close in terms of the overall sound.