APA

Jones L., University of Cambridge Local Examinations Syndicate, . (1991). Cambridge Proficiency Examination Practice 1. Cambridge: Cambridge University Press.

Chicago

Jones Leo, University of Cambridge Local Examinations Syndicate, . 1991. Cambridge Proficiency Examination Practice 1. Cambridge: Cambridge University Press.

Harvard

Jones L., University of Cambridge Local Examinations Syndicate, . (1991). Cambridge Proficiency Examination Practice 1. Cambridge: Cambridge University Press.

MLA

Jones Leo, University of Cambridge Local Examinations Syndicate, . Cambridge Proficiency Examination Practice 1. Cambridge: Cambridge University Press. 1991.