Rajagukguk, C. S., and E. Hutabri. “RANCANG BANGUN APLIKASI PEMANDU WISATA DANAU TOBA BERBASIS WEB MENGGUNAKAN METODE AGILE”. Computer and Science Industrial Engineering (COMASIE), vol. 5, no. 6, July 2021, pp. 110-9, https://ejournal.upbatam.ac.id/index.php/comasiejournal/article/view/4389.