Bukit, N., E. Frida, F. R. A. Bukit, and B. F. Bukit. “Analysis Structure and Morphology of Bentonite-Opba Nanocomposites As Nanofillers”. Journal of Applied Research and Technology, vol. 20, no. 2, May 2022, pp. 117-25, doi:10.22201/icat.24486736e.2022.20.2.1710.