APA

Baker (Ann), . (2008). Tree or Three? (An Elementary Pronunciation Course) (3 CDs). : .

Chicago

Baker (Ann), . 2008. Tree or Three? (An Elementary Pronunciation Course) (3 CDs). : .

Harvard

Baker (Ann), . (2008). Tree or Three? (An Elementary Pronunciation Course) (3 CDs). : .

MLA

Baker (Ann), . Tree or Three? (An Elementary Pronunciation Course) (3 CDs). : . 2008.