Richard Brody's
New Yorker movie blog gave links to a tape collection culled from a French radio show excerpting the approximately 50 hours of interviews Truffaut conducted with Hitchcock over a 4-year period which are found on Tom Sutpen's
blog, "If Charlie Parker Was a Gunslinger, There'd Be a Whole Lot of Dead Copycats."
The interviews, which fed into the (originally 1967, later revised and updated) book
Hitchcock AKA
Hitchcock by Truffaut, written in collaboration with the translator/interpreter for the sessions, Helen G. Scott, are divided into 25 segments.
Unfortunately Sutpen's links no longer seem to work. Try this other site
here. It seems to be the best and most easily accessible at present.
Updated Dec. 1, 2012/2023.