1 1 20 Sebuah kajian internal Wibowo, Wahyu Primary Author Syafrimeizal Primary Author Rubama, Ahmad Primary Author Trenggono Primary Author Afan, Ronal Primary Author Kusumah, Harjana Primary Author Tuty, Nurmala Primary Author Saleh, Usma Primary Author mixed material Jakarta Antam 1997 Compressed_C-2018090713.jpg.jpg