edited by Paul E. Schellinger, Robert M. Salkin
Toppan, 1996
Buku Referensi
Quarterly, 1988
Majalah, Jurnal, Buletin
Taylor and Francis,
Majalah, Jurnal, Buletin
Fox, James R., author
Oceana Publications, Inc, 1992
Buku Teks
Page, G. Terry
New York Kogan Page 1977
Buku Referensi