Haberl, Helmut; และคณะ (July 2007), "Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems", Proceedings of the National Academy of Sciences of the United States of America, 104 (31): 12942–47, Bibcode:2007PNAS..10412942H, doi:10.1073/pnas.0704243104, PMC1911196, PMID17616580
Vitousek, Peter M.; Mooney, Harold A.; Lubchenco, Jane; Melillo, Jerry M. (July 25, 1997), "Human Domination of Earth's Ecosystems", Science, 277 (5325): 494–99, CiteSeerX10.1.1.318.6529, doi:10.1126/science.277.5325.494
Haberl, Helmut; และคณะ (July 2007), "Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems", Proceedings of the National Academy of Sciences of the United States of America, 104 (31): 12942–47, Bibcode:2007PNAS..10412942H, doi:10.1073/pnas.0704243104, PMC1911196, PMID17616580
Haberl, Helmut; และคณะ (July 2007), "Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems", Proceedings of the National Academy of Sciences of the United States of America, 104 (31): 12942–47, Bibcode:2007PNAS..10412942H, doi:10.1073/pnas.0704243104, PMC1911196, PMID17616580
Haberl, Helmut; และคณะ (July 2007), "Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems", Proceedings of the National Academy of Sciences of the United States of America, 104 (31): 12942–47, Bibcode:2007PNAS..10412942H, doi:10.1073/pnas.0704243104, PMC1911196, PMID17616580
Vitousek, Peter M.; Mooney, Harold A.; Lubchenco, Jane; Melillo, Jerry M. (July 25, 1997), "Human Domination of Earth's Ecosystems", Science, 277 (5325): 494–99, CiteSeerX10.1.1.318.6529, doi:10.1126/science.277.5325.494