Wynia, Gary W., author
Cambridge University Press , 1984
Buku Teks
Bone, Hugh A., author
McGraw-Hill, 1965
Buku Teks
edited by Edward Conrad Smith and Arnold John Zurcher
Barnes & Noble, 1966
Buku Teks
Graber, Doris A., author
Congressional Quarterly Press, 1980
Buku Teks
Schmidt, Steffen W., author
Wadsworth, 2009
Buku Teks