APA
May P., . (2004). IELTS. Practice tests with explanatory key. New York: Oxford University Press.
Chicago
May P, . 2004. IELTS. Practice tests with explanatory key. New York: Oxford University Press.
Harvard
May P., . (2004). IELTS. Practice tests with explanatory key. New York: Oxford University Press.
MLA
May P, . IELTS. Practice tests with explanatory key. New York: Oxford University Press. 2004.