BIG ELEPHANT FOUNDATION. (2012). MIND TWISTER MATHS OLYMPIAD WORKBOOK- 2. BIG ELEPHANT FOUNDATION.
Chicago Style (17th ed.) CitationBIG ELEPHANT FOUNDATION. MIND TWISTER MATHS OLYMPIAD WORKBOOK- 2. BIG ELEPHANT FOUNDATION, 2012.
MLA引文BIG ELEPHANT FOUNDATION. MIND TWISTER MATHS OLYMPIAD WORKBOOK- 2. BIG ELEPHANT FOUNDATION, 2012.
警告：這些引文格式不一定是100％准確.