Wiranta, P. J., S. Agustin, and L. Trisnawati. “Analysis of The Compressive Strength of K 225 Concrete Using Palm Oil Shell Waste As A Particular Replacement of Coarse Aggregates High School Of Indragiri Rengat Technology”. Journal of Scientific Research, Education, and Technology (JSRET), vol. 2, no. 1, Jan. 2023, pp. 220-9, https://jsret.knpub.com/index.php/jrest/article/view/63.