Satisfied with material in book, say (7)
I believe the answer is:
content
I believe this is a double definition.
'satisfied' is the first definition.
('content' can be similar in meaning to 'satisfied')
'material in book say' is the second definition.
'with' is the link.
(Other definitions for content that I've seen before include "Quietly happy" , "Satisfied, happy enough" , "state of peaceful happiness" , "Gist" , "Peacefully happy" .)