Giyatmi, Giyatmi, Purwani Indri Astuti, Ratih - Wijayava, & Sihindun - Arumi.
" Indonesian Interference toward English Used on Outdoor Advertisement Boards  and Banner in Sukoharjo, Central Java." <em>Lingual: Journal of Language and Culture</em> [Online], 6.2 (2018): 43. Web. 30 Nov. 2022