@article{55037,
      author = {Simpson, George Gaylord,},
      url = {http://library.usi.edu/record/55037},
      title = {Principles of animal taxonomy.},
      publisher = {Columbia University Press,},
      recid = {55037},
      pages = {247 p.},
      address = {New York,},
      year = {1961},
}