@article{31844,
      recid = {31844},
      author = {Hanna, Thomas,},
      title = {Explorers of humankind /},
      publisher = {Harper & Row,},
      address = {San Francisco :},
      pages = {viii, 147 p. ;},
      year = {1979},
      url = {http://library.usi.edu/record/31844},
}