Ralph Penny

Gramática histórica del español

2014

Studies in eurolinguistics, Bd. 5: Language contact and minority languages on the littorals of Europe

2007

Variacion Y Cambio En Español/ Variation and Change in Spanish (Biblioteca Romanica Hispanica / Roman Hispanic Library)

2004

Variation and Change in Spanish

2000

A history of the Spanish language

1991

Estudio Estructural Del Habla de Tudanca

1978