3 1 20 et.al Primary Author eri mardiani Primary Author nur rahmansyah Primary Author Surniawan Primary Author mixed material 9786020452159 Jakarta Elex Media Komputindo 2018 ID_PKVB62018MTH05PKVB6.jpg.jpg eri mardiani Primary Author Surniawan Primary Author mixed material 9786020247847 Jakarta Elex Media Komputindo 2014 ID_PV2018MTH10PV.jpg.jpg eri mardiani Primary Author nur rahmansyah Primary Author Surniawan Primary Author Yuni Widiastiwi Primary Author mixed material 9786020223018 Jakarta 2013 download_%281%29.jpg.jpg