Gultom, Dame Trully, et al. “The Roles of Cyber Extension Communication Media in Strengthening Horticulture Farmers in Facing Globalization in Lampung Province, Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 26, no. 2, Apr. 2016, pp. 104-17, https://gssrr.org/JournalOfBasicAndApplied/article/view/5420.