Sheeler, W. D. (1978). Welcome to ENGLISH: WORKBOOK 4. English Language Services.
Čikaški stil citiranja (17. izdanje)Sheeler, Willard D. Welcome to ENGLISH: WORKBOOK 4. English Language Services, 1978.
MLA način citiranja (8. izdanje)Sheeler, Willard D. Welcome to ENGLISH: WORKBOOK 4. English Language Services, 1978.
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