Skvarcius, Romualdas, author
Benjamin/Cummings, 1986
Buku Teks
Stanat, Donald D.
Prentice-Hall, 1977
Buku Teks
Ross, Kenneeth A., author
Prentice-Hall, 1985
Buku Teks
Mott, Joe L., author
Reston Publishing, 1983
Buku Teks
Maurer, Stephen B., author
Addison-Wesley, 1991
Buku Teks