Listiawati, Karta Negara Salam, Retno Wulansari, Pramudi Harsono. Promotion Costs Analysis To Increased Volume Sales In The Convection Companies . International Journal of Science, Technology & Management [Internet]. 2021Sep.26 [cited 2025Oct.12];2(5):1542-51. Available from: https://ijstm.inarah.co.id/index.php/ijstm/article/view/300