Cox, George W., author
Wm. C. Brown, 1996
Buku Teks
Stetler, David A.
"Minneapolis Burgess, 1974",
Buku Teks
Shellhammer, H. S., author
The National Press, 1965
Buku Teks
Obenauf, Steven, author
McGraw Hil , 2013
Buku Teks
William Bawen Sarles ...[et.al.]
Harper & Row, 1956
Buku Teks