Suriyok, Khamdan. “Pengaruh Bauran Promosi Terhadap Volume Penjualan”. Jurnal Ilmiah Ecobuss 8, no. 2 (September 30, 2020): 68-74. Accessed April 26, 2024. https://ejournal.upm.ac.id/index.php/ecobuss/article/view/626.