Cita APA (7th ed.)

O'CONNOR, F. (1967). Better english pronunciation. C.U.O..

Cita Chicago (17th ed.)

O'CONNOR, F.D. Better English Pronunciation. London: C.U.O., 1967.

Cita MLA (9th ed.)

O'CONNOR, F.D. Better English Pronunciation. C.U.O., 1967.