Hanh, Nguyen Thu, and Nguyen Tien Lam. “REALIZATION OF INTERPERSONAL MEANING IN U.S PRESIDENT BARACK OBAMA’S SPEECH AT VIETNAM CONVENTION CENTRE: A MOOD SYSTEM ANALYSIS”. VNU Journal of Foreign Studies, vol. 37, no. 1, Feb. 2021, doi:10.25073/2525-2445/vnufs.4656.