H. L. . Panggabean, P. . Widiyanto, I. U. . Yulihapsari, E. P. . Perwitasari, T. . Maianto, and R. F. . Suryawan, “Concepts Marketing Mix : Increase in Sales of Airlines Ticket on Route International”, IJABM, vol. 2, no. 5, pp. 721–730, Oct. 2023.