@article{7996,
      recid = {7996},
      author = {Ehrlich, Paul R.},
      title = {Ecoscience : population, resources, environment /},
      publisher = {W. H. Freeman,},
      address = {San Francisco :},
      pages = {xv, 1051 p. :},
      year = {1977},
      note = {First-2d ed. published under title: Population, resources,  environment.},
      url = {http://library.usi.edu/record/7996},
}