1. Internet resources: https://www.csun.edu/science/chemistry/
  2. The chemistry resource web: https://www.thecatalyst.org/m05demos.html
  3. The science museum web: https://www.csun.edu/science/ref/field_trips/museums.html
  4. Periodic table in royal societyof chemistry: https://www.rsc.org/periodic-table/
  5. Journal: https://www.sciencedirect.com/
  6. Journal: https://www.springer.com/gp/products/journals
  7. Indonesian Journal of Educational Review: https://pps.unj.ac.id/journal/ijer
  8. Chemistry – An Asian Journal : https://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1861-471X
  9. Journal of the learning science : https://www.tandfonline.com/toc/hlns20/current
  10. American Educational Research Association : https://journals.sagepub.com/home/ero