APA

Baker (Ann), . (2011). Ship or Sheep: An Intermediate Pronunciation Course (4 CDs). : .

Chicago

Baker (Ann), . 2011. Ship or Sheep: An Intermediate Pronunciation Course (4 CDs). : .

Harvard

Baker (Ann), . (2011). Ship or Sheep: An Intermediate Pronunciation Course (4 CDs). : .

MLA

Baker (Ann), . Ship or Sheep: An Intermediate Pronunciation Course (4 CDs). : . 2011.