I do agree. I like that they cover all the topics of beekeeping and give a full lesson on bees and beekeeping. But they are limited in the amount of information they have on any topic. Where they devote a paragraph of a chapter to a topic. Their has bee entire books written on the subject. or a particular management technique. or product of the hive.
Although I highly recommend that every beekeeper should read those books, they should also know that there is a lot more information in specialized books.
It's time to apply for your library card most libraries carry a selection of books on beekeeping..