Gershon, S. (2002). English upgrade: Student book. Oxford: MacMillan.
Trích dẫn kiểu ChicagoGershon, Steven. English Upgrade: Student Book. Oxford: MacMillan, 2002.
MLA CitationGershon, Steven. English Upgrade: Student Book. Oxford: MacMillan, 2002.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.