Gilbert, J. B. (1993). Clear speech: Student book (2ª ed.). Cambridge University Press.
Cita Chicago Style (17a ed.)Gilbert, Judy B. Clear Speech: Student Book. 2ª ed. United Kingdom: Cambridge University Press, 1993.
Cita MLA (9a ed.)Gilbert, Judy B. Clear Speech: Student Book. 2ª ed. Cambridge University Press, 1993.
Precaución: Estas citas no son 100% exactas.