University of Michigan & Briggs, S. L. (2002). Examination for the certificate of proficiency in English: Official past papers. Oxford University Press.
Chicago-referens (17:e uppl.)University of Michigan och Sarah L. Briggs. Examination for the Certificate of Proficiency in English: Official Past Papers. Oxford: Oxford University Press, 2002.
MLA-referens (8:e uppl.)University of Michigan och Sarah L. Briggs. Examination for the Certificate of Proficiency in English: Official Past Papers. Oxford University Press, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.