E-BOOK BANGUN RUANG SISI DATAR (1) https://www.youtube.com/watch?v=FMNUKbWSs40&t=616s https://www.youtube.com/watch?v=AomS6WKreyU https://www.researchgate.net/publication/335022528_BAHA N_AJAR_BANGUN_RUANG_SISI_DATAR_UNTUK_KE LAS_VIII 12