Full title is Prolegomena to Any Future Metaphysics That Will Be Able to Present Itself as a Science.
- HTML (9 pages, indexed) at WebExhibits: Causes of Color (Based on translation by Paul Carus)
- Multi-format (HTML, EPUB, Kindle, Text) at Project Gutenberg (Translated by Paul Carus)
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- Hardcover edition (Hackett Pub Co, 1977, 122 pg).
- Paperback edition, translated by Paul Carus (1986, 264 pg).
All links verified on or after November 1, 2020