Hehman, Robert F., author
Costomized Publishing Division, 1976
Buku Teks
Yarbrough, James D., author
Burgess Publishing, 1970
Buku Teks
Nielsen, Lewis T., author
Buegess Publishing, 1967
Buku Teks
Dolphin, Warren D., author
McGraw-Hill, Higher Education, 2008
Buku Teks
Beck, Raymond W., author
Burgess, 1977
Buku Teks