These are indeed great books, although I think that Aronsons book on the family is called "A Family of Kings".
There are many books on Danish royalty, but I presume you mean the Glücksborg dynasty? Hans Roger Madols bio on Christian IX is a very good and informative book, and i think it's translated into English.
Bo Bramsens two volume book, "Huset Glücksborg" (House of Glücksburg) is probably the most comprehensive book on the family, covering the family from the very start and til now.
There are several bios and books about the current members of the DRF.