@article{130266,
      author = {Sanford, David H.,},
      url = {http://library.usi.edu/record/130266},
      title = {If P, then Q : conditionals and the foundations of  reasoning /},
      publisher = {Routledge,},
      recid = {130266},
      pages = {ix, 265 p. :},
      address = {London ;},
      year = {1989},
}