Gunawan, Samuel. “A Comparison of Obama’s 2007 and Hillary Clinton’s 2015 Bids for Presidency Speeches”. k@ta: A Biannual Publication on the Study of Languange and Literature 18, no. 2 (February 1, 2017): 56-62. Accessed December 7, 2024. https://kata.petra.ac.id/index.php/ing/article/view/19017.