Kalangi, J. S., F. R. Tulungen, D. A. Pangkey, E. Lintong, J. Gumerung, and R. R. Kalalo. “Optimization of Promotional Marketing Strategies on Consumer Buying Interest in Okoy Flower Garden Restaurant”. Interdisciplinary Social Studies, vol. 1, no. 10, July 2022, pp. 1296-0, doi:10.55324/iss.v1i10.267.