In 1996, I received my first copy of a book that would prove to give ample fruit to the interest in future investigations on the subject. The city was London, with its many bookshops, and in one of those… I received my first copy of Kings and Queens of England and Great Britain, by Eric R Delderfield.
The edition of the book, which I acquired, may not be quite up to date today – after all, Charles and Diana are no longer married; the Queen has two more grandchildren; Princess Margaret and the Queen Mother have passed away, et cetera. However, it is still an interesting book to rummage through, for the longer historic lines, and details… even if the more current history is not quite up to date.
Today, for basic information, I suspect one would just go to Wikipedia, instead of to an actual book.