Little by little, the problem princes have been facing their flaws and learning more about themselves as Professor Heine grooms them for the throne. But when Count Rosenberg makes another appearance, they realize there's one thing they still know nothing about: the royal tutor himself...
You order them by publisher, 
series, and then author!
!رتّبها حسب النّاشر فالسّلسلة ثمّ الكاتب
Sie werden zuerst nach Verlag,
dann nach Reihe und dann nach dem Autor sortiert!
Se ordenan por editorial, serie y autor.
Se ordenan por editorial, serie y autor.
On range par éditeur,
par collection, puis par auteur !
Comincia ordinando per editore!
Primeiro se ordena por editora,
depois série e só então autor!
Нужно раскладывать по 
издательствам, сериям и авторам.