Government
- California Department of Food and Agriculture’s Bat Guano Labeling Regulations
- Association of American Plant Food Control Officials (AAPFCO), Sea Bird Guano Publications
- National Organic Program Guidance for Processed Animal Manures in Organic Crop Production
Publications
- Biogeochemistry of Vertebrate Excretion (Survey of Contemporary Knowledge of Biochemistry: Volume 96), by George Evelyn Hutchinson, June 14, 1950.
- The Teaming Series Books on Organic Growing by Jeff Lowenfels