Nicholas Rescher on Scientism
The theorist who maintains that science is the be-all and end-all — that what is not in science books is not worth knowing — is an ideologist with a peculiar and distorted doctrine of his own. For him, science is no longer a sector of the cognitive enterprise but an all-inclusive world-view. This is the doctrine not of science but of scientism. To take this stance is not to celebrate science but to distort it by casting the mantle of its authority over issues it was never meant to address.
The Limits of Science (Berkeley, University of California Press : 1984).
(I believe I’ve quoted this before, but its worth returning to)
Limits of Science from Nicholas Rescher on Google books