The Earth Moved: On the Remarkable Achievements of Earthworms by Amy Stewart
The Formation of Vegetable Mould , through the Action of Worms, with Observations on their Habits by Charles Darwin
Earthworm Digest
Journal of American Science, 1(1), 2005, Sharma, et al, Potentiality of Earthworms for Waste Management and in Other Uses - A Review [PDF].
Journey to Forever - Vermicomposting
National Sustainable Agriculture Information Service
Soil Foodweb