aid practical instructional 2002 video importance education SC york ltd andi multimedia pembuatannya arsyad suyanto student text teach learning medan research englewood persada planning dalam academic gall approach kholi writing longman educational alfabeta pembelajaran jakarta definition bisa 2015 language hill media bean cliff heinich college dirgeyasa classroom nunan 2014 harmer AECT 109 english winthrop dan rock switaj tertiary effective harper consideration screencast technology effectivenes 1997 penggunaan new penelitian jersey bandung communication it akbar rulia metode sugiyono matic visual manurung producing journal systematic state teaching elementary guided introduction sarah yogyakarta borg 2013 some unimed REFERENCES pearson ability offset kualitatif improve BRAC perdana using hafizh prentice audio university genre washington rajagrafindo 2004 dhaka row ningsih level pres dayton 1971 mamun hall EFL akhtar recount kemp how 2012 seventh association padang based pasti azhar school gerlach ely 2007 pardiyono use publishing kuantitatif 2016 graw junior edition PT publisher perspective penerbit ESL instruction high 1985 2003