Pyke, M. (1967). The science century. Walker.
Lua i Stíl Chicago (17ú heag.)Pyke, Magnus. The Science Century. New York: Walker, 1967.
Lua MLA (9ú heag.)Pyke, Magnus. The Science Century. Walker, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.