Copi, Irving M., author
Prentice-Hall, 1995
Buku Teks
Carnap, Rudolf, author
Phoenix Books, 1947
Buku Teks
edited by Witold Marciszewski
Martinus Nijhoff Publishers, 1981
Buku Referensi
Bittle, Celestine N., author
The Bruce Publishing, 1950
Buku Teks
Nolt, John, author
McGraw-Hill, 2011
Buku Teks