Catherine De Guzman Laddawan. (2026) Extreme Perlocutionary Force in Contemporary Political Communication: A Comparative Analysis of President Donald Trump's 2017 and 2025 Inaugural Speeches. Rangsit University:ม.ป.ท.Catherine De Guzman Laddawan. 2026. Extreme Perlocutionary Force in Contemporary Political Communication: A Comparative Analysis of President Donald Trump's 2017 and 2025 Inaugural Speeches. ม.ป.ท.:Rangsit University;Catherine De Guzman Laddawan. Extreme Perlocutionary Force in Contemporary Political Communication: A Comparative Analysis of President Donald Trump's 2017 and 2025 Inaugural Speeches. ม.ป.ท.:Rangsit University, 2026. Print.