Zur Geschichte der Zessionlehre / von Klaus Luig. - Luig, Klaus. (OLS)http://pul/name/32420 (Böhlau, 1966)
Contiene indici.
Bibliografia in nota.

Foundations of Logic : 1903-05 / Bertrand Russel ; edited by Alasdair Urquarth with the assistance of Albert C. Lewis. - Russel, Bertrand, 1872-1970. (OLS)http://pul/name/40281; Lewis, Albert C. (OLS)http://pul/name/53146; Urquarth, Alasdair. (OLS)http://pul/name/53145 (Routledge, 1994)
Contiene indici.
Bibliografia in appendice.