Hidayatullah, Alfiansyah Syam, Trismawati Trismawati, and Yustina Suhandini Tjahjaningsih. 2022. “Implementation of Interactive Digital Marketing With the 7P Marketing Concept to Increase Customer Interest on Fly Ash and Bottom Ash Products at PT PJB UP Paiton”. Procedia of Engineering and Life Science 3 (December). https://doi.org/10.21070/pels.v3i0.1311.