“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: Penerapan Interactive Digital Marketing Dengan Konsep 7P Marketing Untuk Menaikkan Customer Interest Produk Fly Ash Dan Bottom Ash Di PT PJB UPPaiton”. 2022. Procedia of Engineering and Life Science 3 (December). https://doi.org/10.21070/pels.v3i0.1311.