Baker, A. (1981). Ship or sheep?: An intermediate pronunciation course (2nd ed., new ed.). Cambridge University Press.

Baker, Ann. Ship or Sheep?: An Intermediate Pronunciation Course. 2nd ed., new ed. Cambridge ; New York: Cambridge University Press, 1981.

Baker, Ann. Ship or Sheep?: An Intermediate Pronunciation Course. 2nd ed., new ed. Cambridge University Press, 1981.