APA引文

(1970). Economic and social assistance to Vietnam 1970. [S.l.]: [s.n.].

Trích dẫn kiểu Chicago

Economic and Social Assistance to Vietnam 1970. [S.l.]: [s.n.], 1970.

MLA引文

Economic and Social Assistance to Vietnam 1970. [S.l.]: [s.n.], 1970.

警告：这些引文格式不一定是100％准确.