Apple iBooks for iOS 7 (free)
iPhone User Guide For iOS 7 (just up today)
https://itunes.apple.com/us/book/iphone-user-guide-for-ios-7/id709872498
iPad User Guide For iOS 7
https://itunes.apple.com/us/book/ipad-user-guide-for-ios-7/id709634245
iPod Touch User Guide For iOS 7
https://itunes.apple.com/us/book/ipod-touch-user-guide-for-ios-7/id709600056
iPhone User Guide For iOS 7 (just up today)
https://itunes.apple.com/us/book/iphone-user-guide-for-ios-7/id709872498
iPad User Guide For iOS 7
https://itunes.apple.com/us/book/ipad-user-guide-for-ios-7/id709634245
iPod Touch User Guide For iOS 7
https://itunes.apple.com/us/book/ipod-touch-user-guide-for-ios-7/id709600056