Muhammad Mubeen Shah,Dr. Humaira Irfan,Maria Shamim. “Critical Discourse Analysis of Pakistani Billboards: A Study of Language Variations in Perspectives of World Englishes”. Harf-O-Sukhan, Vol. 8, no. 1, Mar. 2024, pp. 339-52, https://harf-o-sukhan.com/index.php/Harf-o-sukhan/article/view/1116.