Gilbert, J. B. (1993). Clear speech: Student book (2ª ed.). Cambridge University Press.
Chicagoスタイル(17版)引用形式Gilbert, Judy B. Clear Speech: Student Book. 2ª ed. United Kingdom: Cambridge University Press, 1993.
MLA(9版)引用形式Gilbert, Judy B. Clear Speech: Student Book. 2ª ed. Cambridge University Press, 1993.
警告: この引用は必ずしも正確ではありません.