APA (7th ed.) Zitazioa

Armstrong, D. M. (1983). Whats is a law of nature. Cambridge University Press.

Chicago Style (17th ed.) Zitazioa

Armstrong, D. M. Whats Is a Law of Nature. Cambridge: Cambridge University Press, 1983.

MLA (9th ed.) Zitazioa

Armstrong, D. M. Whats Is a Law of Nature. Cambridge University Press, 1983.