Reference: Gregores and Suárez 1967

Gregores, Emma & Jorge A. Suárez. 1967. A Description of Colloquial Guaraní. (Janua Linguarum: Series Practica, 27.) The Hague, Paris: Mouton & Co. 247pp.

@book{suarez1967colloquial,
  address   = {The Hague, Paris},
  author    = {Emma Gregores and Jorge A. Suárez},
  pages     = {247},
  publisher = {Mouton & Co.},
  series    = {Janua Linguarum: Series Practica},
  title     = {A Description of Colloquial Guaraní},
  volume    = {27},
  year      = {1967}
}