Helen Ball. (2018). Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations) (edition.). HarperCollins UK.
Čikaški stil citiranja (17. izdanje)Helen Ball. Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations). edition. HarperCollins UK, 2018.
MLA način citiranja (9. izdanje)Helen Ball. Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations). edition. HarperCollins UK, 2018.
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