Historians and others frequently rely on what other scholars have already researched and written about a particular topic. These are called as secondary sources. A book-length treatment of a topic, also called a monograph, is a type of secondary source. These books are most often written by a single author/historian.
What is meant by “historical” monograph is not that the book was written in the historical past, but rather that the author is writing about and concerned with a specific set of historical moments, events and processes.
