Παραπομπή σε μορφή APA (7η εκδ.)

Davies, P. C. W. (1995). Are we alone?: Philosophical implications of the discovery of extraterrestrial life. Penguin Books.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Davies, Paul Charles William. Are We Alone?: Philosophical Implications of the Discovery of Extraterrestrial Life. New York: Penguin Books, 1995.

Παραπομπή σε μορφή MLA (8th εκδ.)

Davies, Paul Charles William. Are We Alone?: Philosophical Implications of the Discovery of Extraterrestrial Life. Penguin Books, 1995.