Cita APA (7a ed.)

Penny, R. J. (2000). Variation and change in Spanish. University Press.

Cita Chicago Style (17a ed.)

Penny, Ralph J. Variation and Change in Spanish. Cambridge [etc.]: University Press, 2000.

Cita MLA (9a ed.)

Penny, Ralph J. Variation and Change in Spanish. University Press, 2000.