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
Gooch, R.K. (Robert Kent), 1893-1982
The government of England
D. Van Nostrad, 1937
 Buku Teks