Hashemi L. Louise & Thomas B. Barbara. (2010). Cambridge Grammar for PET with answers: Self-study grammar reference and practice (5th ed.). Cambridge, Cambridge University Press, 2010.
Čikaški stil citiranja (17. izdanje)Hashemi L. Louise i Thomas B. Barbara. Cambridge Grammar for PET with Answers: Self-study Grammar Reference and Practice. 5th ed. Cambridge, Cambridge University Press, 2010, 2010.
MLA način citiranja (9. izdanje)Hashemi L. Louise i Thomas B. Barbara. Cambridge Grammar for PET with Answers: Self-study Grammar Reference and Practice. 5th ed. Cambridge, Cambridge University Press, 2010, 2010.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.