Palmer, Spencer J.
Hollym Corp., 1967
Buku Teks
Palmer, Spencer J.
Po Chim Chai, 1986
Buku Teks
edited by Robert E. Buswell, and Tomothy S. Lee
University of Hawai'i Press, 2006
Buku Teks
Spencer, Donald D.
Prentice-Hall, 1977
Buku Teks
Triningham, J. Spencer
At The Clarendon Press, 1959
Buku Teks