Can we trust Julius Lester

Can we trust Julius Lester. He wrote 'To Be A Slave' and can we trust what he says in this book. I believe we can as most of his writing is taken from people who were there at the time. He has most of his facts and his quotes taken from people who are ex-slaves. He has cited all the people he has gotten this information from. He also is directly related to ex-slaves and probably got some information from them to back up the things he was hearing from other people. I believe that because of these reasons that we can trust Julius Lester about what he has wrote in the book 'To Be A Slave'.