APA-čujuhus (7. p.)
Penny, R. J. (2000). Variation and change in Spanish. Cambridge University Press.
Chicago-čujuhus (17. p.)
Penny, Ralph J. Variation and Change in Spanish. Cambridge, UK ; New York, NY, USA: Cambridge University Press, 2000.
MLA-čujuhus (9. p.)
Penny, Ralph J. Variation and Change in Spanish. Cambridge University Press, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.