Fahrurrozi, Sehati Kaban, Ratna Sari Dewi, Reza Rachmadtullah, Prayuningtyas Angger Wardhani , Uswatun Hasanah. “Developing the Instrument of Pre-Writing Skill to the First Grade Students of Elementary School”. International Journal of Advanced Science and Technology, Vol. 29, no. 06, Apr. 2020, pp. 1932 -40, https://sersc.org/journals/index.php/IJAST/article/view/12898.