Gaya APA

(61413023), A, H, F, H. (2016). Halliday’s Language Function and Its Effectiveness in Barack Obama’s Presidential Campaign Speeches . Surabaya: Universitas Widya Kartika.

Gaya MLA

(61413023), Arina, Huriyatul, Farida, HS. "Halliday’s Language Function and Its Effectiveness in Barack Obama’s Presidential Campaign Speeches". Surabaya: Universitas Widya Kartika, 2016. Text.