NASUTION, U. O.; LIDYA, M.; SYAHPUTRO, S. B. Pengaruh Variasi Produk terhadap Minat Beli Ulang pada Serasa Cake & Coffee Tanjungpinang. Surplus: Jurnal Ekonomi dan Bisnis, [S. l.], v. 4, n. 2, p. 262–266, 2026. DOI: 10.71456/sur.v4i2.1648. Disponível em: https://yptb.org/index.php/sur/article/view/1648. Acesso em: 8 oct. 2026.