Thorpe,Edgar, & Thorpe,Showick. (2003). Objective english. Pearson Education.
Čikaški stil citiranjaThorpe,Edgar, i Thorpe,Showick. Objective English. New Delhi: Pearson Education, 2003.
MLA način citiranjaThorpe,Edgar, i Thorpe,Showick. Objective English. Pearson Education, 2003.
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