Feldman, Richard
Reason and argument
Prentice-Hall, 1999
 Buku Teks SO
Santayana, George
The birth of reason and other essays
Columbia University Press, 1995
 Buku Teks SO
Raz, Joseph
Practical reason and norms
Princeton University Press, 1990
 Buku Teks SO
Handbook of the history of logic
edited by Dov M. Gabbay and John Woods
Elsevier, 2004
 Buku Referensi
Achmad Dardiri
Humaniora, filsafat, dan logika
Rajawali , 1986
 Buku Teks SO