Smellie, Kingsley Bryce, 1897-1987
A hundred years of English government
Gerald Duckworth, 1950
 Buku Teks SO
Gilang Esa Mohamad
Pengaruh Posisi Tawar Fahri Hamzah Terhadap Partai Keadilan Sejahtera (PKS) Dalam Kasus Penolakan Pemecatan Dirinya Oleh DPR-RI Tahun 2016 = The Influence of Fahri Hamzah's Bargaining Position Towards Partai Keadilan Sejahtera (PKS) in the Case of His Dimissal From DPR-RI in 2016
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2019
 UI - Tugas Akhir
Greenstein, Fred I.
The American party system and the American people
Prentice-Hall, 1970
 Buku Teks SO
Stout, Hiram Miller
British government
Oxford University Press, 1953
 Buku Teks SO
Maor, Moshe
Political parties and party systems : comparative approaches and the british experience
Routledge, 1997
 Buku Teks