P. Vitousek

The soil and plant biogeochemistry sampling design for The National Ecological Observatory Network
Hinckley, Eve-lyn S., Gordon B. Bonan, Gabriel J. Bowen, Benjamin P. Colman, Paul A. Duffy, Christine L. Goodale, B. Z. Houlton, et al. 2016. “The Soil and Plant Biogeochemistry Sampling Design for The National Ecological Observatory Network”. Ecosphere 7 (3). doi:10.1002/ecs2.1234.
Human alteration of the global nitrogen cycle: sources and consequences
Vitousek, P. M., J. D. Aber, Robert W. Howarth, Gene E. Likens, P.A. Matson, D.W. Schindler, William H. Schlesinger, and G.D. Tilman. 1997. “Human Alteration of the Global Nitrogen Cycle: Sources and Consequences”. Ecol. Appl. 7: 737-50.
Human alteration of the global nitrogen cycle: causes and consequences
Vitousek, P. M., J. D. Aber, Robert W. Howarth, Gene E. Likens, P.A. Matson, D.W. Schindler, William H. Schlesinger, and G.D. Tilman. 1997. “Human Alteration of the Global Nitrogen Cycle: Causes and Consequences”. Issues Ecol. 1: 1-15.