O`Brien, James A., 1936-, author
McGraw-Hill, 2003
Buku Teks
Monsen, R. Joseph, author
Houghton Mifflin, 1967
Buku Teks
Farmer, Richard N., author
Wadsworth, 1969
Buku Teks
edited by R. Ampalavanar Brown
Routledge, 1996
Buku Teks
Williamson, Oliver E., author
Prentice-Hall, 1970
Buku Teks