Cita APA (7a ed.)

Christophersen, P. (1964). An English Phonetics Course. Longmans.

Cita Chicago Style (17a ed.)

Christophersen, Paul. An English Phonetics Course. London: Longmans, 1964.

Cita MLA (9a ed.)

Christophersen, Paul. An English Phonetics Course. Longmans, 1964.