Huppe, Bernard Felix
Harpur, 1956
Buku Teks
Gibbins, Peter, author
Clarendon Press, 1988
Buku Teks
Ching, Lai Sheng, author
Ryerson Press, 1969
Buku Teks
Lalement, Rene, author
Prentice-Hall, 1993
Buku Teks
Copi, Irving M., author
Macmillan, 1961
Buku Teks