Ploeg, A.
Government in Wanggulam
Martinus Nijhoff, 1969
 Buku Teks
American government
by Susan Welch ... [and others]
Thomson, 2006
 Buku Teks
Donnelly, Thomas C.
The government of Mexico
The University of New mexico Press, 1953
 Buku Teks
Gooch, R.K. (Robert Kent), 1893-1982
The government of England
D. Van Nostrad, 1937
 Buku Teks
Burns, James McGregor
Government by the people
Prentice-Hall, 1972
 Buku Teks