99 Georgian Songs
Great collection of tradition folk, church and urban songs from Georgia. Published by the Centre for Performance Research. (http://thecpr.org.uk/product/99-georgian-songs/)
The Best of Village Harmony
A 25th anniversary collection from a well known American community voice group.
Alison Burns and Gitika Partington
Resource book created by Natural Voice Practioners Network members specially for community choirs.
The New Penguin Book of English Folk Songs
Nice English Folk Song collection
Community Voiceworks 2
Very useful source book