Barney, George C.
Prentice-Hall, 1985
Buku Teks
Barney, George C.
Prentice-Hall, , 1988"
Buku Teks
Barney, George C.
Prentice-Hall, 1988
Buku Teks
Carr, Joseph J.
Reston Publishing, 1982
Buku Teks SO
Jones, Douglas Samuel
Oxford University Press, 1988
Buku Teks