Gray, Charles A.
E.P. Dutton & Co. Inc., 1965
Buku Teks
Mortimer, Charles E.
Publishing, 1983
Buku Teks
Gray, Charles L.
The University of Michigan Press, 1988
Buku Teks
DePuy, Charles H.
John Wiley & Sons, 1975
Buku Teks
Hollander, Stanley C., author
Michigan State University , 1960
Buku Teks