- Multi-format (PDF, EPUB, Daisy, Kindle, Text) at Internet Archive, includes the Correspondence with Arnauld, the Monadology, and the Discourse on Metaphysics (Translated by G. Montgomery)
Available at Amazon.com:
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- Paperback edition of Discourse on Metaphysics and the Monadology, translated by George R. Montgomery (Prometheus Books, 1992, 96 pg).
- Paperback edition of Discourse on Metaphysics, Correspondence with Arnauld and the Monadology, translated by George R. Montgomery (1973, 272 pg).
All links verified on or after December 1, 2019