VERDIYEV NAZIM DAVUD OĞLU; TANRVERDIYEVA ƏFSANƏ ELXAN QIZI. SATIŞ TEXNİKALARI. Reviews of Modern Science, [S. l.], n. 6, 2024. Disponível em: https://ojs.scipub.de/index.php/RMS/article/view/3583. Acesso em: 30 may. 2026.