Haas and Mathieu 1983

Haas, Werner and Mathieu, Gustave Bording. 1983. Deutsch für alle. Toronto: John Wiley. (2nd edition).

@book{Haas-and-Mathieu-1983,
  address   = {Toronto},
  author    = {Haas, Werner and Mathieu, Gustave Bording},
  note      = {2nd edition},
  publisher = {John Wiley},
  title     = {Deutsch für alle},
  year      = {1983}
}