Crystal, D. (1997). The Cambridge encyclopedia of language (2nd ed.). Cambridge University Press.
Cita Chicago (17th ed.)Crystal, David. The Cambridge Encyclopedia of Language. 2nd ed. Cambridge ; New York: Cambridge University Press, 1997.
Cita MLA (8th ed.)Crystal, David. The Cambridge Encyclopedia of Language. 2nd ed. Cambridge University Press, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.