To write "Raison et déraison", Foucault used many sources and he accumulated hundreds of reading notes. Two extracts of this material are presented here:
A series of quotations with their reference
A list of the manuscripts consulted by Foucault.
Foucault did not keep the manuscript of Histoire de la folie (Madness and Civilization), but kept all the preparatory files to which he continued to add after the books publication.