@article{58083,
      author = {Gratzer, George A.},
      url = {http://library.usi.edu/record/58083},
      title = {Universal algebra.},
      publisher = {Van Nostrand},
      recid = {58083},
      pages = {xvi, 368 p.},
      address = {Princeton, N.J.,},
      year = {1968},
}