Rodriguez, Rita M., author
Prentice-Hall, 1984
Buku Teks
Rodriguez, Rita M., author
Prentice-Hall, 1976
Buku Teks
O`Connor, Dennis J., author
Macmillan, 1990
Buku Teks
Globerman, Steven, author
Prentice-Hall, 1986
Buku Teks
Henning, Charles W., author
McGraw-Hill Kogakusha, 1978
Buku Teks