Kusmawati. “PENGARUH BIAYA R&Amp;D BIAYA IKLAN TERHADAP KINERJA LABA”. Jurnal Keuangan dan Bisnis 18, no. 1 (March 10, 2021): 179–190. Accessed January 18, 2025. http://320227.wm3lefoa6.asia/index.php/jkb/article/view/52.