Cita APA (7th ed.)
Penny, R. J. (2000). Variation and change in Spanish. Cambridge University Press.
Cita Chicago (17th ed.)
Penny, Ralph J. Variation and Change in Spanish. Cambridge, UK ; New York, NY, USA: Cambridge University Press, 2000.
Cita MLA (9th ed.)
Penny, Ralph J. Variation and Change in Spanish. Cambridge University Press, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.