A good companion book is "How Apollo Flew to the Moon", by W. David Woods. It fills in a lot of the technical detail that other Apollo space program books omit, without forgetting the human dimension. Amazing effort by a man who is not an engineer, nor affiliated with the original Apollo program. He just had an interest that grew over the years until he was encouraged to put his knowledge into a book. He wrote it like he was explaining Apollo to a friend at his day job.