BIG ELEPHANT FOUNDATION. (2012). MIND TWISTER MATHS OLYMPIAD WORKBOOK- 2. BIG ELEPHANT FOUNDATION.
Čikaški stil citiranja (17. izdanje)BIG ELEPHANT FOUNDATION. MIND TWISTER MATHS OLYMPIAD WORKBOOK- 2. BIG ELEPHANT FOUNDATION, 2012.
MLA način citiranja (9. izdanje)BIG ELEPHANT FOUNDATION. MIND TWISTER MATHS OLYMPIAD WORKBOOK- 2. BIG ELEPHANT FOUNDATION, 2012.
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