Helen Ball. (2018). Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations) (edition.). HarperCollins UK.
Lua i Stíl Chicago (17ú heag.)Helen Ball. Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations). edition. HarperCollins UK, 2018.
Lua MLA (9ú heag.)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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