Octafilia, Y. ., and A. M. . Amin. “MARKETING STRATEGIES TOWARD DIRECT AND INDIRECT PURCHASING AT THE PREMIERE HOTEL PEKANBARU”. International Conference of Business and Social Sciences, vol. 2, no. 1, Mar. 2022, pp. 461-73, https://ojsicobuss.stiesia.ac.id/index.php/icobuss1st/article/view/198.