Studies on Ibero-Romance linguisticsRalph J. Penny, Roger Wright, Peter T. Ricketts · First published 2005RomanceOpen the Tome
Gramática histórica de la lengua españolaMaría Lourdes García-Macho, Ralph J. Penny · First published 2001Open the Tome
The medieval mindA. D. Deyermond, Ian Richard Macpherson, Ralph J. Penny · First published 1997Open the Tome