Achmad, Gusti Noorlitaria, et al. “THE INFLUENCE OF WHATSAPP ADVERTISEMENT ON PURCHASE DECISION TO INCREASE SALES OF LOCAL CULINARY PRODUCTS IN COVID-19 PANDEMIC PERIOD”. International Journal of Economics, Business and Accounting Research (IJEBAR), vol. 4, no. 4, Dec. 2020, doi:10.29040/ijebar.v4i4.1548.