Giyatmi, Giyatmi, 		Astuti, Purwani, 		Wijayava, Ratih, AND 		Arumi, Sihindun.
" Indonesian Interference toward English Used on Outdoor Advertisement Boards  and Banner in Sukoharjo, Central Java" <em>Lingual Journal of Language and Culture</em> [Online], Volume 6 Number 2 (11 January 2019)