Educational Research Council of America. (1968). GCRP language and literature program (Student workbook.). Educational Research Council of America.
Čikaški stil citiranja (17. izdanje)Educational Research Council of America. GCRP Language and Literature Program. Student workbook. [Cleveland, Ohio]: Educational Research Council of America, 1968.
MLA način citiranja (8. izdanje)Educational Research Council of America. GCRP Language and Literature Program. Student workbook. Educational Research Council of America, 1968.
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