AU - Kashkary, Samera Y. ID - 21109 OP - pp. 391-404 T1 - Are Two Better than one? the impact of lenght of time spent in kindergarten on pupils mathematics achievement of primary school [Article] UL - 1 http://search.shamaa.org/fulltext.gif http://www.journals.zu.edu.eg/upload/bcd2fd4c-1458-4c1e-a935-0318a42b402f.pdf النص الكامل (PDF)