Harrison, M. (2012). Cambridge English: Proficiency practice tests : with key : five tests for Cambridge English : proficiency: Mark Harrison. Oxford University Press.
Chicago-referens (17:e uppl.)Harrison, Mark. Cambridge English: Proficiency Practice Tests : With Key : Five Tests for Cambridge English : Proficiency: Mark Harrison. Oxford: Oxford University Press, 2012.
MLA-referens (8:e uppl.)Harrison, Mark. Cambridge English: Proficiency Practice Tests : With Key : Five Tests for Cambridge English : Proficiency: Mark Harrison. Oxford University Press, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.