Dokumentuaren aipamena

APA (7th ed.) Zitazioa
Penny, R. J. (2000). Variation and change in Spanish. Cambridge University Press.
Chicago Style (17th ed.) Zitazioa
Penny, Ralph J. Variation and Change in Spanish. Cambridge, UK ; New York, NY, USA: Cambridge University Press, 2000.
MLA (9th ed.) Zitazioa
Penny, Ralph J. Variation and Change in Spanish. Cambridge University Press, 2000.
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