Dyfyniad APA

Basalla, G. (2007). Civilized Life in the Universe: Scientists on Intelligent Extraterrestrials. OUP.

Dyfyniad Arddull Chicago

Basalla, George. Civilized Life in the Universe: Scientists on Intelligent Extraterrestrials. OUP, 2007.

Dyfyniad MLA

Basalla, George. Civilized Life in the Universe: Scientists on Intelligent Extraterrestrials. OUP, 2007.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.