- HTML (Single page, 211KB) at Trinity College
- HTML search engine, plus the work in 4 text files; at the Chinese University of Hong Kong
- Multi-format (HTML, EPUB, Kindle, Text) at Project Gutenberg
Available at Amazon.com:
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- Hardcover edition (Hackett Pub Co, 1982, 105 pg).
- Paperback edition (Oxford Univ Pr, 1998, 235 pg).
All links verified on or after December 22, 2019