Andrew Karvonen, Federico Cugurullo, Federico Caprotti, editors
Routledge, Taylor & Francis Group, 2019
Buku Teks
Wilson, Ross J., 1981-, author
Taylor & Francis Group, 2018
Buku Teks
Karp, Walter, author
Harper & Row, 1979
Buku Teks
Fried, Robert C., author
Prentice-Hall, 1980
Buku Teks
New York : American Political Science Association
Majalah, Jurnal, Buletin