Proportionality: new frontiers, new challenges
edited by Vicki C. Jackson, Mark Tushnet
Cambridge University Press, 2017
 Buku Teks SO
Barak, Aharon
Proportionality : constitutional rights and their limitations
Cambridge University Press, 2012
 Buku Teks
Simanjuntak, Grisella Giovany
Penerapan asas proporsionalitas dalam perjanjian kemitraan GO-RIDE = Implementation of proportionality principle in GO-RIDE partnership agreement
Fakultas Hukum Universitas Indonesia, 2019
 UI - Skripsi Membership
Melvin Salahuddin
Challenges for the unfccc in indonesia's decentralisation / Melvin Salahuddin
University of Indonesia, Faculty of Law, 2014
 Artikel Jurnal
Graber, Mark A.
A new introduction to American constitutionalism
Oxford University Press, 2015
 Buku Teks