@article{1363176,
      author = {Purcell, Jeanne H., and Leppien, Jann H.,},
      url = {http://library.usi.edu/record/1363176},
      title = {Parallel curriculum units for social studies, grades 6-12  /},
      recid = {1363176},
      pages = {1 online resource (x, 227 pages) :},
}