Mentioned as good at another site, by Jamie Anderson (who has presented songwriting classes):

Songwriting and the Guitar, editor: Jeffrey Pepper Rogers, String Letter Publishing, 2000 (includes Jamie's chapter, Songwriting Traps and How To Avoid Them), www.acousticguitar.com

The Craft of Lyric Writing, Sheila Davis, Writer's Digest Books, 1985

Writing Down the Bones, Natalie Goldberg, Shambhala, 1986

Five Hundred Songwriting Ideas, Lisa Aschmann, Mix Books, 1997

~S~