na INLIS000000000402779 20190926024814 0010-1217000512 190926 | | 978-979-22-9906-9 id 808 808 ONG P Ongky Hojanto Public Speaking Mastery jakarta : Gramedia Pustaka Utama, 2016 808 ONG p 369/SMPBAS/9/16 369/SMPBAS/9/16