Peter Riley. (2012). Cambridge Checkpoint Science Workbook 1 ("New, Workbook".). Hodder Education.
Čikaški stil citiranja (17. izdanje)Peter Riley. Cambridge Checkpoint Science Workbook 1. "New, Workbook". Hodder Education, 2012.
MLA način citiranja (9. izdanje)Peter Riley. Cambridge Checkpoint Science Workbook 1. "New, Workbook". Hodder Education, 2012.
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