Marpaung, Christian Marides
Analisis kebijakan parliamentary threshold (PT) 3,5 % pada UU Pemilu no. 8 tahun 2012 dalam sistem multi-partai dan sistem presidensial di Indonesia = Parliamentary policy analysis threshold (PT) 3,5% on Election Law no. 8 of 2012 in the multi-party system and presidential system in Indonesia
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2013
 UI - Tesis Membership
Belenky, Alexander S.
Understanding the fundamentals of the U.S. presidential election system
Springer, 2012
 eBooks
Ridho Miqdar
Pertarungan partai besar vs partai kecil dalam Perumusan Ambang Batas Presiden (Presidential Threshold) pada Undang-Undang Nomor 7 Tahun 2017 tentang Pemilihan Umum di Dewan Perwakilan Rakyat Republik Indonesia (DPR RI) = Power Struggle big parties vs small parties to the Formulation the Presidential Thereshold on Election Law of Number 7 of 2017 on General Election in the House of Representatives of the Republic of Indonesia (DPR RI)
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2019
 UI - Tesis Membership
Dwi Rianisa Mausili
Presidential threshold anomaly in government system and parliamentary reduction in Indonesia presidential system
Kementerian PPN/Bappenas, 2019
 Artikel Jurnal
The Presidential election an dtransition 1960-1961
edited by Paul T. David
Brookings Institution, 1961
 Buku Teks