"Fundamental ideas of peace including the Treaty of Westfalia (1648) and the League of Nations (1919) in relation to international psychology and revolutions" is a book written by Arthur Macdonald. This work examines the important topic of ensuring peace and stability in international relations through historical context. The author analyzes in detail the Zahidfal Peace Treaty of 1648, which ended the Thirty Years' War, as well as the League of Nations of 1919, which was an attempt to create an international organization to ensure world peace. The book also examines the psychological aspects of international conflicts and the importance of revolutions in the modern world. This work reveals the importance of conflict resolution and maintaining justice in achieving sustainable peace.