Butler, Henry N., author
South-Western Publishing, 1987
Buku Teks
Buchholz, Rogene A., author
Prentice-Hall, 1989
Buku Teks
Bellinger, William Kenneth, author
Routledge, 2007
Buku Teks
Gohagan, John Kenneth, author
McGraw-Hill, 1980
Buku Teks
Bozeman, Barry, author
St. Martin's Press, 1979
Buku Teks