Carnap, Rudolf
Dover Publications, 1958
Buku Teks
edited by Ulrich Hohle and Erich Peter Klement
Kluwer Academic , 1995
Buku Teks
Dalen, Dirk van
Springer-Verlag, 1994
Buku Teks
Copi, Irving M.
Prentice-Hall, 1979
Buku Teks
Gemignani, Michael C.
Addison-Wesley, 1968
Buku Teks