APA引文

Heidmann, J. (1995). Extraterrestrial intelligence. Cambridge: Cambridge University Press.

Trích dẫn kiểu Chicago

Heidmann, Jean. Extraterrestrial Intelligence. Cambridge: Cambridge University Press, 1995.

MLA引文

Heidmann, Jean. Extraterrestrial Intelligence. Cambridge: Cambridge University Press, 1995.

警告：這些引文格式不一定是100％准確.