Cita APA (7a ed.)

Martín Butragueño, P. (2002). Ralph Penny, Variation and change in Spanish. Cambridge University Press, Cambridge, 2000; xiv + 284 pp. El Colegio de México.

Cita Chicago Style (17a ed.)

Martín Butragueño, Pedro. Ralph Penny, Variation and Change in Spanish. Cambridge University Press, Cambridge, 2000; Xiv + 284 Pp. El Colegio de México, 2002.

Cita MLA (9a ed.)

Martín Butragueño, Pedro. Ralph Penny, Variation and Change in Spanish. Cambridge University Press, Cambridge, 2000; Xiv + 284 Pp. El Colegio de México, 2002.