Yusri, J., E. Rossi, A. Pramana, Y. Zalfiatri, R. Ramayuni, and R. Rustam. “Digital Marketing Strategy As the Development of ‘Onspot’ Functional Beverage Business in Pekanbaru City”. Journal of Community Engagement Research for Sustainability, vol. 1, no. 2, Sept. 2021, pp. 98-105, doi:10.31258/cers.1.2.98-105.