Sen, Amartya, 1933-
Development as freedom
Knopf, 1999
 Buku Teks
Morrison, John
This freedom
Penguin Books, 1985
 Buku Teks
Bagas Pratomo
Pengembangan dan Pengujian Robot Arm Skala Kecil denga 2 Degree of Freedom = Small scale Arm robot Development and Testing with 2 Degree of Freedom
Fakultas Teknik Universitas Indonesia, 2022
 UI - Skripsi Membership
Steinby, Torsten
In Quest of freedom
Government, 1971
 Buku Teks
McPherson, James M.
Crossroads of Freedom
Oxford University Press, 2002
 Buku Teks