HARRISON. E. R. (2013). FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL WORKBOOK CLASS-VII. FRANK BROS & CO.
Čikaški stil citiranja (17. izdanje)HARRISON. E. R. FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL WORKBOOK CLASS-VII. FRANK BROS & CO, 2013.
MLA način citiranja (9. izdanje)HARRISON. E. R. FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL WORKBOOK CLASS-VII. FRANK BROS & CO, 2013.
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