Newton, R. G. (1993). What makes nature tick? Harvard University Press; Universities Press.
Lua i Stíl Chicago (17ú heag.)Newton, Roger G. What Makes Nature Tick? Cambridge, Mass. : India: Harvard University Press; Universities Press, 1993.
Lua MLA (8ú heag.)Newton, Roger G. What Makes Nature Tick? Harvard University Press; Universities Press, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.