Floyd, Nancy A., author
1987
Buku Teks
Essick, Edward L., author
Science Research Associates, 1984
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1966
Buku Teks
Potter, George B., author
Business, 1984
Buku Teks
Fried, Louis, author
Reston Publishing, 1979
Buku Teks