Curry, Haskell Brooks (1930). "Grundlagen der Kombinatorischen Logik" [Foundations of combinatorial logic]. American Journal of Mathematics (in German). 52 (3). Johns Hopkins University Press: 509–536. doi:10.2307/2370619. JSTOR2370619.
Curry, Haskell Brooks (1930). "Grundlagen der Kombinatorischen Logik" [Foundations of combinatorial logic]. American Journal of Mathematics (in German). 52 (3). Johns Hopkins University Press: 509–536. doi:10.2307/2370619. JSTOR2370619.