APA
Ladefoged P., . (1968). A phonetic study of west African languages: an auditory-instrumental survey. Cambridge: Cambridge University Press.
Chicago
Ladefoged Peter, . 1968. A phonetic study of west African languages: an auditory-instrumental survey. Cambridge: Cambridge University Press.
Harvard
Ladefoged P., . (1968). A phonetic study of west African languages: an auditory-instrumental survey. Cambridge: Cambridge University Press.
MLA
Ladefoged Peter, . A phonetic study of west African languages: an auditory-instrumental survey. Cambridge: Cambridge University Press. 1968.