Παραπομπή APA

Davies, P. (2007). Goldilocks enigma: Why is the universe just right for life. Penguin.

Παραπομπή Chicago Style

Davies, Paul. Goldilocks Enigma: Why Is the Universe Just Right for Life. New York: Penguin, 2007.

Παραπομπή MLA

Davies, Paul. Goldilocks Enigma: Why Is the Universe Just Right for Life. Penguin, 2007.