Brooks, J. L. (1984). Just before the origin: Alfred Russel Wallace's theory of evolution. Columbia University Press.
Lua i Stíl Chicago (17ú heag.)Brooks, John Langdon. Just Before the Origin: Alfred Russel Wallace's Theory of Evolution. New York: Columbia University Press, 1984.
Lua MLA (9ú heag.)Brooks, John Langdon. Just Before the Origin: Alfred Russel Wallace's Theory of Evolution. Columbia University Press, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.