It's worth noting that both Lea and Jolicoeur are firmly on the side of "use good apples/pears bred for fermenting instead of eating and don't add anything else ever.". If your dad will want to experiment by adding berries, other fruit, pepper, hops, whatever-maybe get a book by somebody with a beer background, and not a wine process&product like Lea and Jolicoeur advocate. If your dad will just be buying juice there might not be as much value in those two books. Who push that cider starts with planting trees and controlling every step of the agricultural process from there.
Beer people are definitely more cavalier.