IOS How to open iBooks

To open the library: 
NSString *stringURL = @"ibooks://";
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
To open the iBooks store at a particular book page, you have to add 
the complete URL to that particular book: 
NSString *stringURL = @"itms-books://itunes.apple.com/de/book/marchen/id436945766";
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
or 
NSString *stringURL = @"itms-bookss://itunes.apple.com/de/book/marchen/id436945766";
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url]; 

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