Ploeg, A.
Government in Wanggulam
Martinus Nijhoff, 1969
 Buku Teks SO
American government
by Susan Welch ... [and others]
Thomson, 2006
 Buku Teks SO
Jennings, Ivor, Sir, 1903-1965
Cabinet government
Cambridge University Pers, 1951
 Buku Teks SO
Donnelly, Thomas C.
The government of Mexico
The University of New mexico Press, 1953
 Buku Teks
Burns, James McGregor
Government by the people
Prentice-Hall, 1972
 Buku Teks SO