Ong Beng Sim creator Tan Chong Eng text xxu Shah Alam, Selangor Penerbit Fajar Bakti, 1993 (Rep. 1996) 2004 2nd ed monographic eng x, 534 p.: ill.; 25 cm general Ong Beng Sim, Tan Chong Eng Mathematics 9676522511 UMP 060606 20251117142422.0 vtls000013027