एपीए उद्धरण

Davies, P. (1995). Are We Alone: Philosophical Implications of the Discovery of Extraterrestrial Life. Penguin Books.

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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