PARKER, A. (2005). MENTAL MATHS STRATEGIES BOOK- 2. SHETH PUBLISHING HOUSE.
Cita Chicago (17th ed.)PARKER, ALAN. MENTAL MATHS STRATEGIES BOOK- 2. SHETH PUBLISHING HOUSE, 2005.
Cita MLA (9th ed.)PARKER, ALAN. MENTAL MATHS STRATEGIES BOOK- 2. SHETH PUBLISHING HOUSE, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.