David Bolton, M. O., & Bué, c. D. R. a. E. (1993). Basic working grammar (1a ed.). Lisboa Editora.
Dyfyniad Arddull ChicagoDavid Bolton, Mats Oscarson, and colab. Desmond Rome and Eduardo Bué. Basic Working Grammar. 1a ed. Lisboa Editora, 1993.
Dyfyniad MLADavid Bolton, Mats Oscarson, and colab. Desmond Rome and Eduardo Bué. Basic Working Grammar. 1a ed. Lisboa Editora, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.