APA

(2004). Cambridge Preliminary English Test 4. With Answers. Cambridge: Cambridge University Press.

Chicago

2004. Cambridge Preliminary English Test 4. With Answers. Cambridge: Cambridge University Press.

Harvard

(2004). Cambridge Preliminary English Test 4. With Answers. Cambridge: Cambridge University Press.

MLA

Cambridge Preliminary English Test 4. With Answers. Cambridge: Cambridge University Press. 2004.