Ehrlich, R. (2001). Nine crazy ideas in science: A few might even be true. Princeton University Press.
Chicago-referens (17:e uppl.)Ehrlich, Robert. Nine Crazy Ideas in Science: A Few Might Even Be True. Princeton, N.J.: Princeton University Press, 2001.
MLA-referens (9:e uppl.)Ehrlich, Robert. Nine Crazy Ideas in Science: A Few Might Even Be True. Princeton University Press, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.