Glossary of Ecology (6th ed.) by Krebs (2009)
- the movement of chemical elements around an ecosystem via physical and biological processes.
Glossary of "Environmental Science: Earth as a Living Planet (2nd ed.)" by Botkin & Keller (1998)
- The cycling of a chemical element through the biosphere; its pathways, storage locations, and chemical forms in the atomosphere, oceans, sediments, and lithosphere.
- Botkin, D. B. & Keller, E. A. 1998. Environmental Science: Earth as a Living Planet, 2nd ed. -xxxxii + 649 pp. John Wiley & Sons, Inc., New York.
- Krebs, C. J. 2009. Ecology, 6th ed. -xvi + 655 pp. Pearson Benjamin Cummings, San Francisco.