For a comprehensive overview:
* "The Problems of Philosophy" by Bertrand Russell: A classic introduction to philosophy, including a chapter on the ontological argument, presenting it in a clear and accessible way.
* "The Metaphysics of Theism" by Richard Swinburne: A well-regarded work that examines various arguments for the existence of God, including the ontological argument, providing a nuanced discussion from a theistic perspective.
* "God: A Guide for the Perplexed" by Rabbi Jonathan Sacks: A readable exploration of different philosophical arguments for and against the existence of God, offering insights into the ontological argument within a wider context.
For a more focused and in-depth analysis:
* "Anselm's Ontological Argument" by Brian Davies: A thorough analysis of Anselm's original formulation of the argument, examining its strengths and weaknesses, as well as its historical and philosophical context.
* "The Ontological Argument" by Alvin Plantinga: A significant contemporary defense of the ontological argument, providing a revised version and addressing common criticisms.
* "God and the Problem of Evil" by J.L. Mackie: While this book primarily focuses on the problem of evil, it also includes a chapter that critiques the ontological argument, offering a perspective from a non-theistic standpoint.
For a more historical and philosophical perspective:
* "The History of Western Philosophy" by Anthony Kenny: Offers a comprehensive overview of philosophical thought, including sections on the ontological argument and its development throughout history.
* "Medieval Philosophy" by Frederick Copleston: A detailed examination of medieval philosophy, providing context for understanding Anselm's work and the subsequent development of the ontological argument.
For a broader philosophical context:
* "The Metaphysics of Morality" by Immanuel Kant: While not directly about the ontological argument, Kant's critique of reason and his emphasis on the limitations of human understanding provide important insights into the philosophical issues surrounding it.
* "The Philosophy of Religion" by William Lane Craig: This book, written from a Christian perspective, discusses a wide range of philosophical arguments for the existence of God, including the ontological argument, and examines different philosophical perspectives on religion.
Ultimately, the best book for you will depend on your level of knowledge, interests, and preferred reading style. I recommend exploring a few different options before making a decision.