Reference: Saltarelli et al. 1988

Saltarelli, Mario, Miren Azkarate, David Farwell, Jon Ortiz de Urbina & Lourdes Oñederra. 1988. Basque. Croom Helm Descriptive Grammars. London: Croom Helm.

@book{saltarelli1988basque,
  address   = {Croom Helm Descriptive Grammars. London},
  author    = {Saltarelli, Mario and Miren Azkarate and David Farwell and Jon Ortiz de Urbina and Lourdes Oñederra},
  publisher = {Croom Helm},
  title     = {Basque},
  year      = {1988}
}