APA

Harrison M., Kerr R., . (1997). First certificate. Practice tests 2. Oxford: Oxford University Press.

Chicago

Harrison M, Kerr R, . 1997. First certificate. Practice tests 2. Oxford: Oxford University Press.

Harvard

Harrison M., Kerr R., . (1997). First certificate. Practice tests 2. Oxford: Oxford University Press.

MLA

Harrison M, Kerr R, . First certificate. Practice tests 2. Oxford: Oxford University Press. 1997.