Stumpf, Samuel Enoch, 1918- 1998, author
McGraw-Hill, 1999
Buku Teks
Buku Teks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
Zeller, Eduard, 1814-1908, author
Meridian Books, 1960
Buku Teks
Fung, Yu-lan
The Free Press, 1976
Buku Teks