BIG ELEPHANT FOUNDATION. (2012). MIND TWISTER MATHS OLYMPIAD WORKBOOK- 5. BIG ELEPHANT FOUNDATION.
Cita Chicago (17th ed.)BIG ELEPHANT FOUNDATION. MIND TWISTER MATHS OLYMPIAD WORKBOOK- 5. BIG ELEPHANT FOUNDATION, 2012.
Cita MLA (9th ed.)BIG ELEPHANT FOUNDATION. MIND TWISTER MATHS OLYMPIAD WORKBOOK- 5. BIG ELEPHANT FOUNDATION, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.