William Mortensen: The Command to Look: A formula for picture success, 1937
William Mortensen: Mortensen on the Negative
Ansel Adams: The Negative
It is surprising how similar results these two completely different approaches give. And that, I think, may well be the reason for the hostility.
I'll add one more I have learned a lot from:
Willi Beutler: Meine Dunkelkammer-Praxis