APA

CAMBRIDGE OF UNIVERSITY LOCAL EXAMINATIONS SYNDICATE, . (1992). Cambridge Proficiency Examination Practice 4. Cambridge: Cambridge University Press.

Chicago

CAMBRIDGE OF UNIVERSITY LOCAL EXAMINATIONS SYNDICATE, . 1992. Cambridge Proficiency Examination Practice 4. Cambridge: Cambridge University Press.

Harvard

CAMBRIDGE OF UNIVERSITY LOCAL EXAMINATIONS SYNDICATE, . (1992). Cambridge Proficiency Examination Practice 4. Cambridge: Cambridge University Press.

MLA

CAMBRIDGE OF UNIVERSITY LOCAL EXAMINATIONS SYNDICATE, . Cambridge Proficiency Examination Practice 4. Cambridge: Cambridge University Press. 1992.