“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 (December 22, 2022). Accessed October 26, 2026. https://pels.umsida.ac.id/index.php/PELS/article/view/1311.