na INLIS000000000013401 20200914021902 0010-0920006044 ta 200914 g 0 eng 535 535 NEL l Nelkom Light And Sound London : Heinemann Education, 1950 418 hal : Ilus ; 21 cm CAHAYA OPTIK DINAS PERPUSTAKAAN DAN KEARSIPAN KOTA MEDAN 3249/S/PUM/2019