Valera, Salvador. “English ‘-Ly’ Adverbs: From Subject Orientation to Conversion”. Studia Anglica Posnaniensia 49, no. 1 (December 30, 2014): 77–102. Accessed January 10, 2026. https://pressto.amu.edu.pl/index.php/stap/article/view/stap-2014-0004.