Fess, Philip E., author
South-Western Publishing , 1993
Buku Teks
Fess, Philip E., author
McGraw-Hill, 1984
Buku Teks
Helmkamp, John G., author
John Wiley & Sons, 1983
Buku Teks
Niswonger, Clifford Rollin, 1907-, author
South-Western Publishing, 1969
Buku Teks
Thacker, Ronald J., author
Prentice-Hall, 1979
Buku Teks