@article{912430,
      author = {Sigala, Marianna, and Christou, Evangelos, and Gretzel,  Ulrike,},
      url = {http://library.usi.edu/record/912430},
      title = {Social media in travel, tourism and hospitality : theory,  practice and cases  /},
      recid = {912430},
      pages = {1 online resource (307 pages) :},
}