@article{61551,
      recid = {61551},
      author = {Rider, Paul R.},
      title = {Plane trigonometry; twelve chapters from First-year  mathematics for colleges.},
      publisher = {Macmillan},
      address = {New York,},
      pages = {180 p.},
      year = {1953},
      url = {http://library.usi.edu/record/61551},
}