李冰. (2011). 寻找外星人: Searching for intelligent alien life. 北京师范大学出版社.
Dyfyniad Arddull Chicago李冰. 寻找外星人: Searching for Intelligent Alien Life. 北京师范大学出版社, 2011.
Dyfyniad MLA李冰. 寻找外星人: Searching for Intelligent Alien Life. 北京师范大学出版社, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.