APA引文

(1990). Algebraic equations. [S.l.]: [s.n.].

Trích dẫn kiểu Chicago

Algebraic Equations. [S.l.]: [s.n.], 1990.

MLA引文

Algebraic Equations. [S.l.]: [s.n.], 1990.

警告：这些引文格式不一定是100％准确.