Riggs, Fred W., author
Houghton Miffiln, 1964
Buku Teks
Riggs, Fred W., author
Rajawali, 1985, 1988
Buku Teks
Riggs, Fred W., author
Rajawali, 1985, 1988
Buku Teks
Sage Periodeicals Press, 1992
Majalah, Jurnal, Buletin
Kamrava, Mehran, author
Routledge , 2000
Buku Teks