O. N. P. Okolie, “Production and Commercialization of Mulled Zobo Drink”, Direct Res. J. Agric. and Food Sci., vol. 13, no. 3, pp. 97–108, Sep. 2025, Accessed: Aug. 28, 2026. [Online]. Available: https://journals.directresearchpublisher.org/index.php/drjafs/article/view/466