Book Question

For the several books in the game, I'm not sure how long they have been around, but are they repeatable, like if i beat NF with the book, turn it in, can i get the book again and go at it again or what? someone please help me

yes, rinse and repeat

is there a way to get credit for beating the first time or is that just lost cred.

If you beat a quest without a book on you you can pay to have it filled in. However this will not work for missions that were completed before the introduction of books.

yes you can reacquire them...