Hepner, Harry W., author
Prentice-Hall, 1961
Buku Teks
Hepner, Harry W., author
Prentice-Hall, 1971
Buku Teks
Mosley, Donald C., author
South-Western Publishing, 1985
Buku Teks
Beach, Dale S., author
Macmillan, 1980
Buku Teks
Hunsaker, Phillip L., author
A Touchstone Book, 1986
Buku Teks