@article{216441,
      author = {Segal, Nancy L.,},
      url = {http://library.usi.edu/record/216441},
      title = {Entwined lives : twins and what they tell us about human  behavior /},
      publisher = {Dutton,},
      recid = {216441},
      pages = {xx, 396 p. :},
      address = {New York :},
      year = {1999},
}