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