Foster, Gerard N., author
Macmillan, 1994
Buku Teks
Carnap, Rudolf, author
Phoenix Books, 1947
Buku Teks
Copi, Irving M., author
Prentice-Hall, 1995
Buku Teks
Hogger, Christopher John, author
Academic Press, 1984
Buku Teks
edited by Witold Marciszewski
Martinus Nijhoff Publishers, 1981
Buku Referensi