एपीए उद्धरण

Không rõ. (1997). Cambridge proficiency examination practice 3: University of Cambridge local examinations syndicate. TP Hồ Chí Minh.

शिकागो स्टाइल उद्धरण

Không rõ. Cambridge Proficiency Examination Practice 3: University of Cambridge Local Examinations Syndicate. TP Hồ Chí Minh, 1997.

एमएलए उद्धरण

Không rõ. Cambridge Proficiency Examination Practice 3: University of Cambridge Local Examinations Syndicate. TP Hồ Chí Minh, 1997.