@article{1363200,
      author = {Leppien, Jann H., and Purcell, Jeanne H.,},
      url = {http://library.usi.edu/record/1363200},
      title = {Parallel curriculum units for mathematics, grades 6-12 /},
      recid = {1363200},
      pages = {1 online resource (xii, 139 pages) :},
}