Murphy, R., & Altman, R. Grammar in use. Reference and practice for intermediate students of English. Answer Key.
Čikaški stil citiranja (17. izdanje)Murphy, Raymond, i Roann Altman. Grammar in Use. Reference and Practice for Intermediate Students of English. Answer Key.
MLA način citiranja (8. izdanje)Murphy, Raymond, i Roann Altman. Grammar in Use. Reference and Practice for Intermediate Students of English. Answer Key.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.