APA引文

Sun, P. P. (1972). The defense of freedom. s.n.

芝加哥风格引文

Sun, Patrick Pichi. The Defense of Freedom. [S.l: s.n, 1972.

MLA引文

Sun, Patrick Pichi. The Defense of Freedom. s.n, 1972.

警告：这些引文格式不一定是100％准确.