Monograph is a breave paper based in experiences of author(s) in combination with other studies that related similar knowledges. Those authors can't be expertise on the theme necessarily.
Writing a book is a work for an expertise of materia, reveal experiences of author(s) for years working on that, trials, systematics researches, e.g. All this information are integrated and style of redaction is very similar but really hardest and largest than a monograph.