Hogger, Christopher John, author
Academic Press, 1984
Buku Teks
Maier, David, author
The Benjamin Cumming Pub., 1988
Buku Teks
Copi, Irving M., author
Macmillan, 1972
Buku Teks
Copi, Irving M., author
Macmillan, 1961
Buku Teks
Clark, K.L., author
Prentice-Hall, 1984
Buku Teks