@book{WolfCummings2011,
  author    = {Wolf, Hans-Georg and Cummings, Patrick},
  title     = {A dictionary of Hong Kong English : words from the fragrant harbor},
  publisher = {Univ. of Hong Kong},
  address   = {Hong Kong},
  isbn      = {988-808330-9},
  pages     = {275 S.},
  year      = {2011},
  language  = {en}
}
@book{WolfPolzenhagen2009,
  author    = {Wolf, Hans-Georg and Polzenhagen, Frank},
  title     = {World Englishes : a cognitive sociolinguistic approach},
  series = {Applications of cognitive linguistics},
  volume    = {8},
  journal   = {Applications of cognitive linguistics},
  publisher = {Mouton de Gruyter},
  address   = {Berlin, New York},
  isbn      = {978-3-11-019633-7},
  doi       = {10.1515/9783110199222},
  pages     = {XIV, 278 S.},
  year      = {2009},
  language  = {en}
}