@base . . a ; "2549-9947" ; . a ; . a ; "2549-9947" ; . "Indonesia" . a ; ; "20180113170100.0"^^ ; ; . a . a , , ; , , ; "IJCER (International Journal of Chemistry Education Research)" ; ; ; ; "2549-9947" ; ; ; "2549-9947" ; ; "2549-9947" ; "IJCER (International Journal of Chemistry Education Research)" ; . a , ; "IJCER (International Journal of Chemistry Education Research)" .