Nurlela Sari, Mohamad Syarif Sumantri, and Ishak G Bachtiar. “The Development of Science Teaching Materials Based on STEM to Increase Science Literacy Ability of Elementary School Students”. I. J. Of Advances in Scientific Research and Engineering-IJASRE (ISSN: 2454 - 8006), vol. 4, no. 7, July 2018, pp. 161-9, doi:10.31695/IJASRE.2018.32808.