@Book{WASSA:2013,
  editor    = {Alexandra Balahur  and  Erik van der Goot  and  Andres Montoyo},
  title     = {Proceedings of the 4th Workshop on Computational Approaches to Subjectivity, Sentiment and Social Media Analysis},
  month     = {June},
  year      = {2013},
  address   = {Atlanta, Georgia},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W13-16}
}