@article{912431,
      recid = {912431},
      author = {Gertwagen, Ruth, and Jeffreys, Elizabeth,},
      title = {Shipping, trade and crusade in the medieval Mediterranean  : studies in honour of John Pryor /},
      pages = {1 online resource (399 pages) :},
      url = {http://library.usi.edu/record/912431},
}