Comparative study of socil, psychological and biological aspects of aging among the normals,mentlly ill and mentally retarded / Syeda Nazneen Begum [Thisis M.Phil] Begum, Syeda Nazneen 362.3 BEC Thesis(M.Phil) - - Department of Psychology, University of Dhaka, Year : 1988. Includes Bibliography and references. Dhaka : University of Dhaka, 1988. 1988. 1988 Text vii, 84 + 18 p. :