Hidayatullah, A. S. ., Trismawati, T. and Tjahjaningsih, Y. S. . (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: Penerapan Interactive Digital Marketing Dengan Konsep 7P Marketing Untuk Menaikkan Customer Interest Produk Fly Ash dan Bottom Ash di PT PJB UPPaiton”, Procedia of Engineering and Life Science, 3. doi: 10.21070/pels.v3i0.1311.