“Study Addition of Bamboo Leaf Ash As a Substitute for Cement and Coconut Fiber As an Additive to the Compressive Strength of Concrete: Addition of Bamboo Leaf Ash As a Substitute for Cement and Coconut Fiber As an Additive to the Compressive Strength of Concrete”. Teras, vol. 11, no. 3, Sept. 2021, https://ojs.unsiq.ac.id/index.php/teras/article/view/3162.