Prototractatus : an early version of Tractatus Logico-Philosophicus
by Ludwig Wittgenstein. Edited by B. F. McGuinness, T. Nyberg and G. H. Von right. Translated from German by D. F. Pears and B. F. McGuinness
- London Routledge & Kegan Paul 1971
- 256p.; 25cm.