Cita APA (7a ed.)

(1971). Drills and exercises in english pronunciation: Consonats and vowels. Collier-Macmillan international.

Cita Chicago Style (17a ed.)

Drills and Exercises in English Pronunciation: Consonats and Vowels. New York: Collier-Macmillan international, 1971.

Cita MLA (9a ed.)

Drills and Exercises in English Pronunciation: Consonats and Vowels. Collier-Macmillan international, 1971.