APA
Sommerstein A. H., . (1977). Modern phonology. Edward arnold, London: .
Chicago
Sommerstein Alan H, . 1977. Modern phonology. Edward arnold, London: .
Harvard
Sommerstein A. H., . (1977). Modern phonology. Edward arnold, London: .
MLA
Sommerstein Alan H, . Modern phonology. Edward arnold, London: . 1977.