Lecture on Ethics
(engl.)
at The Galileian Library
[www.galilean-library.org/witt_ethics.html]

Tractatus Logico-Philosophicus
(german)
at KingFisher Software
[www.kfs.org/~jonathan/witt/tlph.html]

Tractatus Logico-Philosophicus
(engl.: C.K. Ogden)
at KingFisher Software
[www.kfs.org/~jonathan/witt/tlph.html]