Patterson, George N., author
International Studies Group, 1966
Buku Teks
Patterson, George N., author
International Studies Group, 1966.
Buku Teks
Cole, John W., author
Academic Press, 1974
Buku Teks
Clementina Acedo, Don Adams, Simona Popa, editor
[Sense, ], 2012
eBooks
Russel Sage Foundation, 2004
Buku Teks