na INLIS000000000007635 20220310122811 220310||||||||| | ||| |||| || 9796020274096 010-0322002411 i 004.11 004.11 FER t Sulianta, Feri & Rakhmat, Fajri Teknik Hebat Merancang Aplikasi Instan Berkualitas Jakarta PT. Elex Media Komputindo 2015 171 hlm Operating System