Look at the examples below. Are they scholarly or not -- and how do you know?
In History, books (also called academic monographs) are vital to scholarly conversation and historical research as they offer in-depth exploration, authoritative scholarship, and the preservation of knowledge. History relies on books more than many other disciplines due to its emphasis on primary sources and in-depth analysis. Books provide comprehensive context, peer-reviewed scholarship, and enduring contributions, essential for preserving historical knowledge and enabling historians to interpret and analyze the past in detail.
Any of these subjects can be combined in a LibrarySearch Advanced Search with Subject: sources OR correspondence OR narratives to locate primary sources in published form.