kelly, R. (1971). The use of English for Technical students. The English language book society.
Čikaški stil citiranja (17. izdanje)kelly, R. The Use of English for Technical Students. NULL: The English language book society, 1971.
MLA način citiranja (9. izdanje)kelly, R. The Use of English for Technical Students. The English language book society, 1971.
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